Online Lumens to watts Calculator
Online Web Code Test |
Online Image Picker |
Online Color Picker
Lumens to watts calculator
Lumens to watts
Old light sources such as incandescent bulbs or halogen lamps were easy to choose. Here the wattage was the most important indicator for the brightness. If a 60W bulb fails, it could be simply replaced by a new 60W bulb. The replaced lamp was just as bright as before and there was no need to worry about the correct brightness.
For LED lamps, the power consumption is also indicated in watts. However, the wattage plays a minor role now and allows only a very rough conclusion on the actual brightness. Different components in various LED lamps lead to varying brightness with the same power consumption.
For example, a 5W LED illuminant of type A can light up much brighter than a second 5W LED lamp of type B. This is possible because lamp A could achieve a better efficiency through higher quality components and therefore emits more light. For the comparability of LED lamps the brightness is indicated in lumens.
Lumens to watts calculation formula
Energy saving lamps have high luminous efficacy (more lumens per watt).
The power P in watts (W) is equal to the luminous flux ΦV in lumens (lm), divided by the luminous efficacy η in lumens per watt (lm/W):
P(W) = ΦV(lm) / η(lm/W)
Lumens to watts table
| Lumens | Incandescent light bulb (watts) |
Fluorescent / LED (watts) |
|---|---|---|
| 375 lm | 25 W | 6.23 W |
| 600 lm | 40 W | 10 W |
| 900 lm | 60 W | 15 W |
| 1125 lm | 75 W | 18.75 W |
| 1500 lm | 100 W | 25 W |
| 2250 lm | 150 W | 37.5 W |
| 3000 lm | 200 W | 50 W |