The power of led nite light bulbs is usually low, generally between 0.5W and 5W. In contrast, traditional incandescent bulbs are generally between 25W and 100W, and fluorescent lamps are generally between 10W and 20W. Therefore, the power of LED night lights is very low.

Luminous efficacy (lm/W) = Luminous flux (lm) ÷ Power (W) For example, if the luminous flux of an LED bulb is 800 lumens and the power is 8 watts, its luminous efficacy is: Luminous efficacy = 800 lm ÷ 8 W = 100 lm/W