Enter the total lumens and the power in watts into the calculator to determine the lumens per watt. This calculator helps in evaluating the efficiency of light bulbs or lighting systems.
Lumens Per Watt Formula
The following formula is used to calculate the lumens per watt.
LPW = L / W
Variables:
- LPW is the lumens per watt (lm/W)
- L is the total light output measured in lumens (lm)
- W is the power consumption measured in watts (W)
To calculate lumens per watt, divide the total light output in lumens by the power consumption in watts.
What is Lumens Per Watt?
Lumens per watt is a measure of the efficiency of a light source. It indicates how much light (in lumens) is produced for each watt of electricity consumed. Higher lumens per watt values indicate more efficient lighting, as more light is produced with less energy. This is an important metric when comparing different lighting options, especially for energy-saving purposes.
How to Calculate Lumens Per Watt?
The following steps outline how to calculate the Lumens Per Watt.
- First, determine the total light output (L) in lumens (lm).
- Next, determine the power consumption (W) in watts (W).
- Next, gather the formula from above = LPW = L / W.
- Finally, calculate the Lumens Per Watt (LPW) in lm/W.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Total light output (L) = 800 lumens (lm)
Power consumption (W) = 10 watts (W)
