Lumens Per Watt
by Smith Lighting on 8/7/2017
The energy it took to produce that work In lighting, the work is measured in lumens. The electrical energy is measured in watts.So, to determine the efficiency of a light bulb, you need to know two things. One is the amount of light that the light bulb puts out and the other is the amount of electricity it consumes to produce that much light.
Both of the values you need to determine the efficiency -- the wattage and the lumens, or "initial lumens," should be clearly marked on the packaging that the light bulb comes in. Once you've found those two numbers, all you have to do is divide the number of lumens by the number of watts. That will give you the standard measure of light bulb efficiency, the lumens per watts.
