Convert Kilolumens to Watts (at 555 nm)
Convert Kilolumens (klm) to Watts (at 555 nm) (W₅₅₅) instantly and accurately.
Conversion Formula
W₅₅₅ = klm × 1.464128843
About Kilolumens
The kilolumen (klm) equals 1 000 lm. High-efficiency LED light fittings: a modern 100 W-equivalent LED lamp emits 1.4-1.6 klm; a 100 W halogen PAR38 spot approximately 1.1 klm; short-throw projectors are rated at 1-5 klm (ANSI lumens). The standard unit for commercial LED fixture specifications and projector brightness. 1 klm = 10³ lm.
About Watts (at 555 nm)
The watt at 555 nm equals 683 lm exactly, by the 2019 SI definition fixing the luminous efficacy constant K_cd = 683 lm/W at 540 THz (≈ 555 nm, the peak of the photopic eye-sensitivity curve V(λ)). Used in LED optical design and photonics research to convert between radiometric power and photometric flux at peak eye sensitivity. 1 W₅₅₅ = 683 lm.
Quick Reference Table
| Kilolumens (klm) | Watts (at 555 nm) (W₅₅₅) |
|---|---|
| 1 klm | 1.46413 W₅₅₅ |
| 2 klm | 2.92826 W₅₅₅ |
| 5 klm | 7.32064 W₅₅₅ |
| 10 klm | 14.6413 W₅₅₅ |
| 25 klm | 36.6032 W₅₅₅ |
| 50 klm | 73.2064 W₅₅₅ |
| 100 klm | 146.413 W₅₅₅ |