Luminous Flux Converter
Convert between luminous flux and equivalent power
rate：1 W = 0.25 W
Results in all units
38 W| Unit | Symbol | Value |
|---|---|---|
| Luminous Flux | ||
| Lumens | lm | 570 |
| Equivalent Power (Approx) | ||
| Watts (LED) | W | 7.125 |
| Watts (CFL) | W | 9.5 |
| Watts (Incandescent) | W | 38 |
About Luminous Flux Conversion
38 Watts (Incandescent) equals 9.5 Watts (CFL). The conversion rate is 1 W = 0.25 W. You can switch to any other unit of this category above and see the result instantly.
This converter supports 4 units in total, including Lumens, Watts (LED), Watts (CFL), Watts (Incandescent), and covers metric, imperial and Chinese traditional systems.
When purchasing LED bulbs, flashlights, or projectors, lumens are the key parameter. This tool helps you convert traditional incandescent watts to equivalent LED lumens and watts.
All values follow internationally accepted definitions and are rounded to the decimals you choose. The calculation runs entirely in your browser, so nothing is uploaded or stored on a server.
History & Background
The term "lumen" comes from Latin for light. In the mid-20th century, photometry defined the lumen as the luminous flux emitted by a point source of 1 candela over a solid angle of 1 steradian.
Conversion Details
Luminous flux (lm) measures the total visible light emitted. Watt (W) is electrical power. This tool provides an approximate estimate based on standard efficiencies.
When buying bulbs, lumens determine brightness, not just watts.