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Small enclosed light fittings can trap heat even from a CFL or LED light bulb and reduce its life, so a halogen lamp, which is less susceptible to heat, may be the solution in that case. However, the light fitting's size, whether it has an effective reflector dish, the translucence of the glass and so on can make a big difference. There's no performance difference between bayonet cap (BC) and Edison screw (ES) mounts on light bulbs. Most lamps now state their light output in lumens (lm), which is more accurate and useful, as long as you know what the numbers mean. But incandescent equivalence is an imprecise measure of light output, and in any case incandescent light bulbs have been largely out of the market for many years, so it won't mean much to many people these days. When CFLs first appeared, they usually had an "incandescent equivalent" guide on their packaging, to help consumers choose the right model (e.g.
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LED light bulbs use less power compared to CFLs, halogens and incandescent lights. Generally, for two light bulbs of the same type, the one that uses more watts will be the brighter. That's why they're now mostly phased out, but they're still available for specialty uses, such as in oven lights, where suitable LED or CFL alternatives have not yet been developed.
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do not touch J-type bulbs with bare hands because high temperatures may crack the quartz bulb if it has been etched with oils from hands and fingers. Because of their high operating temperatures and unique bases, thermal control and socket design within the fixture are important. They may be double or single ended and are available in a variety of lengths and wattage. Tube-shaped halogen bulbs (J-type) are made of quartz glass to withstand high operating temperatures. Most halogen bulbs use about one-quarter less energy than the standard incandescent, but recently some halogen lamps have entered the market that use half the energy of standard incandescents. Halogen infrared (IR) bulbs also have a reflective coating to redirect infrared energy back onto the filament to save energy. Halogen bulbs have an inner capsule that contains halogen gas, which extends bulb life. Halogen screw base bulbs fit into the same medium-based sockets as common incandescent bulbs. Halogen bi-pin bulbs only fit into fixtures designed exclusively for their use.
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Some halogen bulbs have a pin base (bi-pin). Restrict their use to applications where short hours of use are expected, or where there are no other alternatives. However, halogen bulbs offer significantly lower efficacy and shorter life than fluorescent and LED bulbs. Due to the addition of halogen gas and in some products a coating that reflects infrared energy, halogen incandescent bulbs are somewhat more efficacious (the amount of light produced per unit of input power) than common incandescent bulbs.