Efficient & Effective Kitchen Lighting
There's a critical missing element in most American kitchens, and it's not a $10,000 range or a stainless steel French door refrigerator. It's simply good lighting. Most kitchens not only do not have enough lighting, they have the wrong kind of lighting.
Your kitchen is more than just a place to cook and eat. It usually serves as the administrative and social hub of the home.
Because it typically opens for business before dawn and closes long after sunset, a kitchen uses a lot of energy for lighting. That makes this room an important place to use efficient lighting.
While remodeling your kitchen, you have the perfect opportunity to create an effective but also highly efficient lighting system.
Designing a lighting system that provides just the right light yet uses very little electricity is the goal of lighting design. It is not a trivial process. And it requires an intimate understanding of how light works.
Electrical Discharge (Arc) Lamps
Electrical discharge lamps create light by jumping a spark across two electrodes surrounded by inert gas.
The most common household incarnation of this type of lamp is the tubular fluorescent lamp found in just about all workshops, garages, and basements.
Other types of electrical discharge lamps include sodium and mercury vapor lamps — used only for street lights and other outdoor applications and xenon-arc lamps used in special applications such as movie projectors, searchlights, and headlights for luxury cars. These collectively are sometimes referred to as High-Intensity Discharge — HID — lamps.
More Than You Ever Wanted To Know About Lighting
If you have ever watched a welder at work, you know that arc welding produces an amazingly bright light — so bright that special eye protection is required. This was the first electric lamp: the carbon arc lamp. The 1860 Republican convention that nominated Abraham Lincoln for president was held in a large wooden building in Chicago lit by carbon arc lamps. The fact that it did not burn down, eliminating the newly formed Republican Party, is a testament to careful and constant vigilance. Temperamental, dangerous, expensive, and requiring constant adjustment, these lamps were not practical for everyday use.
A few years later an English chemist, Sir Joseph Wilson Swan, D.Sc.h.c., FRS (and not Thomas Edison as you were taught in school), developed the practical incandescent lamp, the first relatively safe source of electric lighting.
There have been huge improvements in lighting since the 19th century, but almost all the lamps we use are still of the two types: incandescent and electrical discharge (the new name for arc lamps). The only new kind of lamp developed in the past 100 years is the light-emitting diode (LED) which works on an entirely different principle.
How Electricity is Converted to Light
Light is composed of photons — very small particles that our eye can see. Photons move very quickly. In fact, they travel at, ahem, the speed of light. They also vibrate. The rate of vibration, or frequency, determines the type and color of the light they produce. We see in only a small portion of the total light spectrum. We can see only "visible light." The rest of the spectrum including infrared and ultraviolet, is invisible to us, although other animals can see this light very well, which is why they seem to see in the dark. It's actually not dark to them.
Converting electricity into light requires adding energy to an atom until one of the electrons orbiting the nucleus of the atom jumps to a higher orbit. It then starts losing energy, and when it loses enough energy, it drops back down to its former orbit, and in the process shoots out a photon. Then the cycle repeats itself. It all happens very fast — the entire cycle of electron movement to a higher orbit then back down to the lower one takes just a tiny fraction of a second — and to a lot of atoms at the same time. The result is the steady flow of photons that we see as a stream of light. Some materials do better at producing light than others. In incandescent lamps, the material most commonly used is tungsten.
The Edison Screw
The Edison Screw is not, as you might think, the hosing you get from the Electric Company every summer on your air-conditioning bill. It's the standard light bulb base used in North America and most of the rest of the world.
The screw base was designed by Thomas Edison at the end of the 19th century. By 1909 it had become the de facto standard in North American, supplanting other bulb bases including the Westinghouse spring clip base devised by Nikola Tesla to get around Edison's patented bulb base.
Its chief competitor in the world of electric lighting is the bayonet mount used as the standard light bulb base in many former members of the British Empire including the United Kingdom, Australia, India, Sri Lanka, Ireland, and New Zealand, as well as parts of the Middle East and Africa.
In the rest of the world, the bayonet base is a fringe player used mostly in automotive lamps (because it better resists loosening from vibration), flashlights, and certain appliance lamps.
The wedge base is found on small bulbs such as mini-lamps used on Christmas trees and some halogen lamps (see photo below).
Screw bases are designated with the letter "E" followed by a number that indicates the diameter of the base in millimeters (i.e., E26 has a diameter of 26 mm.)
|Candelabra||E12 N. Amer.
|Intermediate||E17 N. Amer.|
|Standard||E26 N. Amer.
|Mogul||E39 N. Amer.|
There are seven common sizes of screw-in sockets used for light bulbs in the U.S. and Europe. Other sizes are in use, but they are for specialty products like movie projector bulbs.
The most common base size in North America is the E26 (Standard or MES), usually paired with the A-Series or pear-shaped bulb, the standard light bulb shape in the U.S. and Canada.
Intermediate E17 bases are often used in small table lamps and the lamps inside refrigerators and microwaves in the U.S.
The E14 small base is used mostly in Europe in place of the E17.
The larger Mogul or Goliath buses must be used with any bulb drawing more than 300 watts of electricity.
Tiny pea bulbs with an E5 screw base are usually found only on model trains and in automobiles, and in other hobby or craft applications. Some older Christmas tree bulbs used the E5 base.
E26 and E27 bulbs are usually interchangeable, as are E39 and E40 bases, due to loose tolerances and minor differences in size, but care must be taken to avoid incompatible voltages. For example, a 100-watt general-purpose Japanese bulb will usually fit in an American socket, but 120 volt U.S. standard electricity will usually fry the bulb in short order.
Did Edison Invent the Light Bulb?
Almost certainly not.
Sir Joseph Swan, a British inventor, first patented a workable incandescent light bulb in Britain 10 years prior to Edison's patent.
Swan published his work in Scientific American where Edison presumably read about it.
Swan sued Edison in English courts for patent infringement and won. Edison was forced to give Swan a substantial interest in Edison's British electricity venture, renamed Edison and Swan United Electric Company, colloquially known as "Ediswan" Electric.
On this side of the Atlantic, Edison fared no better. The U.S. Patent Office invalidated Edison's patent, ruling in 1883 after concluding that Edison had based his patent on the earlier work of William E. Sawyer who with Albon Man founded the Electro-Dynamic Light Company to produce his electric lamps. The company later became the lighting division of Westinghouse Corporation.
While some give Edison credit for inventing a practical filament that could be mass-produced inexpensively, in fact, the filament used in manufacturing for years before the tungsten filament was discovered, was a cellulose filament also invented by Swan.
Light is produced in an incandescent lamp by heating a thin tungsten wire to a very high temperature (around 2200°C), causing it to incandesce or glow.
The wire is called a filament and the incandescence is a result of the filament's resistance to the flow of electrical current. Most of the energy produced is converted to heat. But some of the energy results in light.
The enclosure or glass envelope around the filament is called the bulb and serves two primary functions. First, it keeps oxygen away from the filament. When the filament is exposed to oxygen, it quickly "oxidizes" and breaks within seconds. Secondly, the enclosure maintains a constant environment for the filament to retard the evaporation of tungsten. As the tungsten evaporates, the light eventually "burns out" when a point is reached at which the filament does not have enough tungsten to incandesce.
For the standard A-Series incandescent lamp, that time is about 1,000 hours of steady use (flipping the light on and off — as we do in the real world — reduces that time to a few hundred hours). The enclosure is usually filled with inert gas such as argon and nitrogen. Halogen and xenon (pronounced z-non, not x-non) lamps are merely varieties of incandescent lamps filled with slightly different gas mixtures. Bulbs come in a variety of shapes and sizes depending on their use and light output requirements.
Understanding Light Quality
Light quality has two parts: "color temperature" and "color rendering."
The more obvious of the two is color temperature, — whether the light appears 'warm' (yellow) or 'cool' (blue).
Color temperature is usually stated in Kelvins (K) in the U.S. and Canada. An incandescent lamp is about 3000K (three thousand Kelvins — yellow/warm). Sunlight is about 5000K (blue/cool). Fluorescent lamps come in these and other color temperatures. Which one you choose is subjective — like picking paint colors.
Today, the most used color temperature is 3500K, not too cool, not too warm. This color is often preferred for retail, office, and high activity residential spaces. Natural "daylight" lamps are the preference for bath- and dressing rooms.
The other part of light quality is color rendering, this is the ability of a light source to reveal the "true" color of an object — that is, the color of the object as it appears at under the noonday sun. Light sources with poor color rendering cloud the difference between similar colors. For example, a slate green wall may appear to be the same color as a gray-blue wall, or dark amber paint may look the same as light brick red.
|Photo: Energy Star|
Color rendering is expressed as a number on the Color Rendering Index (CRI), a scale from 0 to 100, with higher values being better. Most old-style fluorescent lamps had poor color rendering (50 - 40) which is not flattering to either colors or people (dull colors and gray complexions). The newer fluorescents have a very good CRI (from around 75 up to as high as the 90s), which reveal true colors more accurately. the minimum CRI rating for any lamp is 80.
How to Determine Light Quality
Manufacturers are not required to disclose either the color temperature or color rendering of their lamps. Most do not, and such terms as "daylight" or "natural light" do not necessarily indicate a specific color temperature. Sylvania's daylight bulbs have a temperature of 3500K, while other "daylight" lamps range up to 5000K.
However, any lamp rated as an Energy Star product now has to disclose its color temperature. The Energy Star is awarded to only fluorescent bulbs that meet strict efficiency, quality, and lifetime criteria. Energy Star qualified fluorescent lighting uses 75% less energy and lasts up to ten times longer than normal incandescent lights. The small increase in the initial cost of these lamps is more than offset by their increased efficiency and longevity. In terms of life-cycle costs, they are a true bargain and should be your first choice.
Some manufacturers now label their CFLs with a 3 digit "light quality" code to indicate the color rendering and color temperature of the lamp. The first digit represents the rounded off CRI, while the second two digits indicate the color temperature. For example, a CFL with a CRI of 83 and a color temperature of 2,700 K would be given a light quality code of 827 — a warm light that has good color rendering.
Incandescent lamps are known for their warm color, resulting from the fact that they emit more low-frequency red and orange light than high-frequency blue and violet. Cheaper than any other lighting option to install, incandescent lamps are more expensive than every other lighting option to burn.
Because they consume so much electricity incandescents are banned in the U.S. and have been since January 1, 2014. The Energy Independence and Security Act of 2007 allows only special-use incandescents that cannot be replaced by a more efficient technology to be sold. Some examples are small bulbs like appliance bulbs and Christmas tree lamps, some colored bulbs, hard use lamps where vibration could destroy a CFL ballast in minutes, bug lamps, and infrared heat lamps. But with these few exceptions, the standard household A-Series incandescent bulb is gone from this country and most of the rest of the world.
The tubular fluorescent lamp is the common household version of the electrical discharge or arc lamp. The technology has come a long way since the Republican National Convention in 1860. The lamps are now very safe and very efficient. In fact, fluorescent bulbs are up to 20 times more efficient than incandescent lamps. A newer, more compact, design with a screw base intended to replace incandescent lamps (compact fluorescent lamps or "CFL"s) is 2-10 times more efficient, although 2-5 is more common in household models. Some 35 watt CFLs have the same light output as 150-watt incandescents.
A fluorescent lamp is a more complicated device than an incandescent lamp. It is an arc lamp inside a glass tube. Electrical current jumps from one electrode to the other through a mixture of argon gas that contains a tiny spec of mercury. The electricity vaporizes the atoms in the mercury forcing it to emit photons. Unfortunately, these are in the ultraviolet range, and we cannot see them. So one more step is needed. The ultraviolet photons strike a phosphorus coating applied to the inside of the glass tube. The phosphorus absorbs the ultraviolet photons and releases photons in the visible spectrum that we can see. This is the "fluorescence" in fluorescent bulbs. The color or quality of the light emitted is controlled by the particular composition of the phosphorus applied to the tube.
Fluorescent lamps need a device called a "ballast" to provide the proper electrical input. Unlike the incandescent bulb, the electrical input to a fluorescent bulb is not constant. Electrons at rest prefer to stay that way. It takes a strong jolt of electricity to get them moving enough to arc. But once they are moving, they need very little electricity to keep moving. So the ballast has to produce a strong initial current to get the process started, then cut back slowly as the conductivity inside the bulb increases. The current they apply is also not constant. They work in pulses, sending current for a brief while, then turning it off, then back on, and so on.
The old electro-magnetic ballasts operated at 60 cycles per second — meaning that the lamp turned off and back on 60 times each second. Some people could see the resulting "flickering" and hear the high-pitched hum. A few people got headaches and nausea from it. The new electronic ballasts are a tremendous improvement. They operate at 24,000 CPS or higher and use less energy. There is no discernible flicker and no hum.
But, there is a problem with CFLs used in recessed ceiling fixtures. We are finding that CFLs installed with the ballast at the top, "ballast-up", do not last very long. Many other contractors are experiencing the same problem. No one knows why, although there are several theories. Ballast-up CFLs still outlast incandescent bulbs, but only by a factor of 2x or so.
Fluorescent lamps do not abruptly "burn out" like incandescents. Over time they merely get dimmer, eventually losing as much as 30% of their light. Most people don't notice the change. What eventually fails in most fluorescents is the ballast. Once this is gone, the light simply will not work and requires replacement.
The unattractive "blue-ish" light once associated with fluorescent lamps is pretty much a thing of the past (See Sidebar). "Daylight" or "natural" light fluorescents emit more light in the red-yellow range, emulating the warm look of familiar incandescent light. For most uses, a light somewhere between warm incandescent and cool fluorescent is about right. For bathrooms and dressing rooms where makeup is applied, a cooler, natural daylight, color is generally preferred.
A Halogen lamp is not a different kind of lamp, it is merely another form of incandescent lamp.
It has a tungsten filament just like a regular incandescent, but because the lamp operates at a very high temperature, the bulb is more durable quartz instead of glass. Instead of containing argon and nitrogen like a regular incandescent lamp, the bulb is typically filled with argon and a trace amount of bromine or iodine vapor. Bromine and iodine are elements from the halogen group of elements; — hence "quartz-halogen".
As is the case with a regular incandescent, the tungsten evaporates slowly whenever the lamp is in use, eventually depleting the tungsten to the point where it will no longer emit light. But the argon-halogen gas in a halogen lamp carries the evaporated tungsten particles back to the filament and re-deposits them. This gives the lamp a longer life than regular A-Series incandescent lamps and ensures a cleaner bulb wall for light to shine through. Halogen lamps are slightly more efficient than regular incandescent lamps, but not greatly so. Their real advantage is in their longer rated life before burn-out, not in their efficiency.
The newest incarnation of the quartz lamp for household use is the xenon lamp. The hype surrounding Xenon bulbs suggests that they are a radical innovation in lighting technology. In fact, they are merely a halogen lamp filled with xenon rather than argon gas. Developed originally for automobile headlights, The bulb has migrated into household low-voltage systems. Its advantages are that it burns slightly cooler and produces a more even "whiter" light than regular halogen lamps.
Halogens last between 2,000 and 3,000 hours compared to regular incandescent lamps that burn for only about 1,000 hours. However, CFLs last 8,000 to 10,000 hours and full-size fluorescent lamps at about 20,000 hours far out-perform halogen lamps.
Light-emitting diods, however, outlast them all.
Unlike "innovations" such as halogen and xenon bulbs, light-emitting diodes (LEDs) are truly something new. Although invented in 1962 by Nick Holonyak, Jr., LEDs did not become commercially practical as a replacement for incandescent and fluorescent lamps until 1995 when Jürgen Schneider, a German physicist, developed an LED that produced a full-spectrum white light in contrast to earlier "white" LEDs which were blends of red, green, and blue light.
LEDs don't have filaments to burn out. Instead, they produce light from one of the simplest electronic semiconductors: a diode. A diode is a semiconductor composed of two different materials bonded together. Electrons flow from one material to the other, producing a current. This current results in the release of photons.
All semiconducting materials produce photons, but in most semiconductors, the electron jump is so short that the photon produced is in the ultra-violet range, a higher frequency than we can see. Special materials, usually modified aluminum-gallium-arsenide (AlGaAs) are used for LEDs because they force the electrons to jump a larger gap so photons are produced in the visible spectrum. The gap can be tuned to produce different frequencies and thus different colors of visible light.
But this is not yet all of the story. In an ordinary diode, the semiconductor material itself absorbs a lot of the light energy. LEDs are specially constructed to release a large number of photons outward and usually housed in a bulb that directs most of the light out of the tip of the bulb. You can see this directional effect in traffic signals that use LEDs. From head on the light is bright and clear. As you move to the side, however, the light becomes dimmer until at some point it cannot be seen at all.
Because LED bulbs are clusters of diodes, they can be made "smart". Smart bulbs are internet-capable. They allow lighting to be customized, scheduled, and controlled remotely using a smartphone. They can be programmed to change brightness or color temperature to fit a particular mood or time of day. Bright, cool light that's closer to blue has an energizing effect and is best for the morning wake-up. Softer, warm light is more relaxing and is best after the sun has gone down. Some smart bulbs can change from visible light to infrared to help your home security cameras see in the dark, others have built-in movement sensors and cameras to detect intrusion. Some include speakers to enhance your surround-sound experience.
The Best Light for Kitchen Countertops
The best lighting for kitchen countertops requires attention to two main criteria: the amount of light falling on the countertop, which is called illuminance level; and the evenness of the lighting, or uniformity.
Illuminance is determined by measuring the light level at various points on the countertop, using a light meter then averaging the results to get an overall level of illuminance.
To make the process more precise, a grid is usually laid on the countertop, and measurements are taken at every grid intersection. For kitchen countertops, the recommended level of illuminance is 500 lux.
In case you were asleep when lux was discussed during your Introduction to Electrical Engineering class in junior high, a lux is defined as:
" …the unit of illuminance and luminous emittance, measuring luminous flux per unit area."
Glad we were able to clear that up for you after all these years.
Actually, in English rather than engineer-speak, a lux is equal of one lumen of illumination on one square meter of surface area, so 500 lux just means illumination of 500 lumens on a square meter of countertop. We try to bring the average ambient illuminance level of the whole kitchen to about 200 lux. So, the task lighting for a countertop should add another 300 lux to the ambient light level.
Uniformity, or evenness of the countertop lighting, is equally important. Uniform lighting is easier to work under. It does not strain the eyes as much as alternating bright light and shadow. A countertop is generally considered uniformly lit if the brightest spot on the countertop is not more than 5 times brighter than the darkest spot. The result is usually expressed as a ratio, for example, 4:1, meaning the brightest area of the countertop is four times brighter than the darkest area. We strive for a 3:1 ratio.
Much of providing uniform lighting is positioning the lamps that illuminate the countertop so they don't throw shadows. There are a variety of techniques to achieve the desired effect, including bouncing light off of the wall to create a wash of reflected light that helps eliminate hot spots.
The service life of LEDs is somewhat difficult to measure since it, more than for any other lighting technology depends on environmental factors and design. Recently, however, manufacturers have begun rating their LEDs at about 70,000 hours — or 3 1/2 times the lifespan of a fluorescent tube. About 10 years of normal use. But again, this estimate may be difficult to interpret. An LED "bulb" is actually a cluster of dozens to hundreds, even thousands, of individual LEDs. Some of these can "burn out" without much decrease in overall lighting. And, even the term "burnout" is not accurate in describing an LED. LEDs slowly decrease in light output, but rarely reach zero light. The Illuminating Engineering Society (IES) currently recommends considering an LED "burnt out" when it reaches 30% of its original light output.
The price of semiconductor devices has plummeted over the past decade, making LEDs a more cost-effective lighting option for a wider range of lighting applications. The development of a replacement for the standard A type incandescent bulb – what we think of as the standard lightbulb – with an E26 Edison screw base that fits a standard light socket has skyrocketed their popularity.
Efficient Lighting Requires Precise Design
- Efficient lighting starts with good design. The principals are fairly obvious:
- Use the most efficient lamp appropriate for the application.
- Plan circuits so that unnecessary lights may be turned off without affecting necessary light.
- Make lights easy to control so that it is convenient to turn off lights no longer needed.
- Layer lighting for maximum impact. Ambient lighting provides general room illumination. Task lighting helps homeowners see better where they need it – undercabinet lighting in the kitchen to help in preparing meals, for example. Accent lighting adds sparkle by focusing on an architectural detail such as a display cabinet or on photos or artwork.
A task area is any place in a kitchen where work is done. The cleanup area around the sink, the cooking area surrounding the range, the countertop where food is prepared are all task areas.
Task areas are best lit with bright (but not glaring), shadowless light from two or more light sources. This is usually done with a combination of general room lighting combined with focused undercabinet lighting. Until a few years ago, fluorescent tubes were our first choice for under cabinet lighting because of their high lumens per watt. We typically recommended flat T5 or T8 fluorescent lamps with electronic ballasts (or the flatter T5 lamps if the light valance is very narrow). These lamps are hidden up under the wall cabinets they are attached to, so they don't have to be pretty (which is a good thing, because they're not).
Today we are more likely to use low voltage strip LEDs. The lighting they produce is even more uniform and efficiency is high – 60 lumens per watt is average or about 4 times the efficiency of an incandescent bulb. The individual LED bulbs are tiny and easy to conceal and the strips last a long time. How long is just an estimate by manufacturers. Around six years is average, but we installed some strips 12 years ago that are still burning brightly.
How Much Light Do I Need?
There's a rule-of-thumb formula for calculating the amount of ambient light you should have in each room or area of your home… and it's not difficult, just some basic arithmetic.
Multiply the length times the width of the room in feet. Then, multiply that number times 24 to get the lumens required.
Example: A room is 12 ft. x 16 ft. Multiply 12 x 16 x 24 = 4,608 lumens.
For specific task lighting in areas where stronger light is needed, multiply the area's square footage by 40 rather than 24 to find the needed lumens. A kitchen countertop or work island are examples of task areas in your remodeled kitchen.
Example: To adequately light a 6' x 2' countertop multiply 6 x 2 x 40 = 480 lumens.
Think Lumens, Not Watts
We are used to thinking of lighting in terms of watts. Wattage is not a measure of light output, however. It is a measure of electrical input. Over the years it has become the de facto standard for sizing incandescent lamp output So, now all types of lamps, not just incandescents, are rated for their light output in watts. You will see at CFL or LED marked as equivalent to a 60-watt bulb, for example. This makes it easy to buy the right combination of light bulbs no matter the type of lamp you select.
But, Lumens is the correct measure of light output. All light bulbs will be rated for lumen output after 2012. So, it is best to get used to thinking in lumens, not watts.
The conversion is easy. A watt produces about 14-18 lumens (we use 16 as the average) in an incandescent bulb, so a 100-watt bulb is about 1,600 lumens, give or take. Any bulb rated 1,500-1,700 lumens will produce about as much light as a 100-watt incandescent bulb, although CFLs and LEDs will use considerably fewer watts of electricty to do so.
If you employ a lighting consultant to design the lighting for your kitchen remodel, he or she will use much more sophisticated methods, including meters that measure the amount of light falling on each surface (see the sidebar "The Best Light for Kitchen Countertops", this page, for more information), the amount of glare, and the location and duration of shadows. But, for most kitchens, this simple calculation and some common sense are all that is needed.
If you already have T5 and T8 fluorescent undercabinet fixtures, you can buy LED replacements that take LED tube bulbs. These are usually called LED-ready fixtures. The bulbs look just like the fluorescent tubes they replace but do not need a ballast.
The underside of the wall cabinets is where most designers put task lights. Where there are no upper cabinets, then there are two choices: projecting light from a ceiling-mounted fixture, or using pendant lamps that hang on long cords from the ceiling. Island lighting and lighting over the sink are often done this way. The key is to use soft, shadowless light and to direct the light so your body does not cast a shadow on the work area. Making sure there is enough light is also critical. Lighting experts use special meters to measure the amount of light falling on the work surface and from this information have produced tables that tell us how much light we need to provide in each situation.
Since CFLs produce little heat, they are especially suitable for recessed fixtures. Incandescent lamps produced so much heat that special recessed fixtures were needed for contact with insulation in the ceiling to prevent fires. CFLs don't produce nearly as much heat, but most electrical codes have not caught up yet, so these special fixtures are still required.
Incandescent lamps are also suitable for task lighting — just more expensive to operate. Recessed incandescent lights above counters, usually in the form of halogen or xenon low-voltage lights, can provide good task light — especially if limited "spot" lighting is required. Many manufacturers make a line of low-voltage halogen lamps specifically designed for this application. But, unlike the softer fluorescent lamps, these lights cast very hard shadows which make their placement critical to avoid eye strain and even headaches in some people.
General Room Lighting
General room lighting or "ambient lighting" is the overall light that fills in shadows, reduces contrast, and lights vertical surfaces to give the space a brighter feel. Used cleverly, it can even trick the eye into believing the kitchen is more spacious than it really is. (See Getting More Kitchen Space for more details.) This background light is what you need for casual activities in the kitchen. If the kitchen has light-colored surfaces and lots of windows you should have plenty of natural ambient light during the day. But, kitchens are used from before dawn until after midnight — we can't rely on windows and skylights alone to provide adequate room lighting.
Fluorescent tubes are well suited to the job of providing general room illumination or "ambient" light. They provide broad, even illumination and their efficiency makes it possible to fill the space with light without turning it into an oven in the Summer.
You can put the tubes in a central fixture but you may want to try some other approaches, like placing them on top of the upper cabinets to reflect light off the ceiling. This technique is called "cove lighting". If you have at least 12 inches of space from the top of the upper cabinets to the ceiling, this is an inexpensive way to brighten up a kitchen. But it works best if the kitchen cabinets are specially designed for cove lighting, including placing a reflective surface on the top of the cabinet. Another nice thing about cove lighting is that you can buy the cheapest fixture that works — it will never be seen. A fluorescent fixture so ugly that you wouldn't install it in your garage is perfect for cove lighting and costs about $15.00.
For accent or small area lighting, use CFLs where possible and halogen/xenon lamps in preference to incandescent bulbs. Although more efficient than other incandescents, halogen lamps are still much less efficient than fluorescents. Their main advantage is a crisper, white light and better control over the light beam.
Kitchens and baths should have a low-voltage standing light — a light that is constantly on at night. In most kitchens, the standing light is the fixture over the sink. A new option is a string of perimeter toe-kick lights.
The toe-kick is that recess under the front of the cabinet where your feet go when you are working at the cabinet. Low-voltage linear lighting systems located inside the toe-kick "float" the cabinets in a pool of light.
The design effect is dramatic, and because the perimeters of the kitchen are outlined in light, it is easy to find your way around without stubbing a toe. Toe-kick lights are typically rope lights (LED pea bulbs linked together) often controlled by a motion sensor that turns the lights on when someone enters the room – but only at night. Like all electronic devices, the price of this sophisticated switching has plummeted in recent years, making it an affordable option for most homeowners.
Wireless Light Switches
Good lighting design requires good lighting control. Lighting controls allow you to put the right amount of light in the right places and turn off unneeded lights without affecting lighting actually in use.
Today there are central electronic control panels that allow you to switch lights on and off throughout the house based on time of day, the amount of sunlight, and how the rooms are being used at the moment. For most of us, this is a little too much switch, but they are available.
Lighting control is now easter than ever with wireless switches. Wireless switches use technology similar to garage door openers. The switch sends a radio signal up to 50 feet to tell a specific light to turn off or on. Wireless central controls can be used in place of wired switches to handle all of the switches in a house — lights, fans, appliances, and security.
In an age when copper wire is quickly becoming a rare metal, wireless operation is becoming a more cost-effective option — especially in remodels. Wireless switches can save money in kitchen remodeling because they require no wires to the switch, no demolition, no patching, and no re-painting.
Most remote switches are powered by batteries, but some use energy harvesting instead of batteries. The act of throwing the switch creates enough energy to send a radio signal to the receiver. The only problem with energy harvesting switches, apart from their higher cost, is that throwing the switch does not feel normal, which disconcerts some people until they get used to the absence of the expected "click".
Dimmer switches reduce light output and energy use. Older CFLs did not dim, but there are now CFLs for use in dimming circuits. They are more expensive than standard CFLs, but they are available.
Simple on/off switches can help save energy if fixtures are divided into separately switched task areas. For example, the counter, island, range, and sink should each have a separate switch.
Behind the Scenes: The Hidden Kitchen
Lighting is not, of course, the only structural issue in designing a remodeled kitchen. Putting together a kitchen is not a trivial process. Besides the obvious considerations: new cabinets, appliances, a new floor, and paint or wallpaper, there are many structural considerations. The structure is invisible, and usually not very pretty, but very important. Without adequate electricity, lighting, plumbing, heating and venting — all the new cabinets and … (Continues)