With standard incandescent bulbs being phased out,
many maintenance professionals and property managers are choosing more efficient halogen bulbs as a reliable replacement.
How Incandescent & Halogen Bulbs Work
Incandescent and halogen bulbs work much the same way. They produce light by heating a tungsten metal filament until it
is white hot. When the filament wears out, the bulbs go dark. The main difference between the two bulb types is the inert
gases produced in the bulb and how those gases affect the life of the filament.
Vaporized tungsten deposits on the inside of the incandescent bulb.
Eventually, the filament becomes too thin to carry a charge, and the bulb burns out.
Halogen bulbs last longer because of the halogen gas
inside. When the bulb is turned on, heated gas, such as iodine or bromine, bonds with vaporizing tungsten. It then re-deposits
the tungsten back onto the filament, extending the life of the bulb.
Compared to less-efficient incandescent bulbs, halogen bulbs:
Last significantly longer
Halogen bulbs have a useful lifespan of 2,250 to 3,500 hours, while incandescent bulbs average only 750 to 1,000 working
Use up to 28% less energy
Halogen bulbs are a more energy-efficient lighting source
and can save on utility expenses when switching from incandescent.
Produce more visible light
Halogen bulbs have a higher luminous efficacy, a measurement of how many lumens are produced per watt of energy. The
higher the number, the more visible light produced. For example, glass and quartz halogens have a 16-24 luminous efficacy
(lm/W), while 40-100 watt standard incandescent bulbs have a 12.6-17.5 lm/W.