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the same as any other light bulb.

caveat:

emergency exits lights have a power source independent of the building power.

if you turn off the main power to the building the power to the exit lamps is still on

usually a small fused disconnect very near the main breakers.

These lamps are on 24/7 and are usually low voltage with battery backup

old ones may use showcase lamps or several nightlight bulbs,

or small florescent lamps

new ones usually LEDs

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