Incandescent Bulb 
 
 
For Electric Customers

An incandescent light bulb, also called a lamp or globe, is a bulb which produces light as electricity flows through and heats a filament wire until it glows. Incandescent bulbs are manufactured in a wide range of sizes, light output and voltage ratings, from 1.5 volts up to 300 volts. Incandescent bulbs are less efficient than several newer types of light bulbs; most incandescent bulbs convert less than 5% of the energy they use into visible light with the remaining energy being converted into heat-wasting energy.

On Jan. 1, 2012, a law phasing out the current standard 100-watt incandescent bulbs went into effect. This opened the door for new technology to improve the filament that makes the new bulbs up to 28% more efficient. The new incandescent bulb operates the same as current traditional bulbs and has the same shape and base; most people won't notice any difference in the color or quality of light. The next time you are shopping for replacement 100-watt incandescent bulbs, look for new ones labeled "72-watt soft white." The old incandescent bulbs will not be taken off store shelves but manufacturing will be phased out as they are sold off. In 2013, the old 75-watt incandescent bulbs will be phased out and 60- and 40-watt bulbs are scheduled to be phased out in 2014. For more information on the new style 100-watt bulb, go to the Department of Energy website.

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