Convert Watts (at 555 nm) to Kilolumens
Convert Watts (at 555 nm) (W₅₅₅) to Kilolumens (klm) instantly and accurately.
Conversion Formula
klm = W₅₅₅ × 0.683
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.
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.
Quick Reference Table
| Watts (at 555 nm) (W₅₅₅) | Kilolumens (klm) |
|---|---|
| 1 W₅₅₅ | 0.683 klm |
| 2 W₅₅₅ | 1.366 klm |
| 5 W₅₅₅ | 3.415 klm |
| 10 W₅₅₅ | 6.83 klm |
| 25 W₅₅₅ | 17.075 klm |
| 50 W₅₅₅ | 34.15 klm |
| 100 W₅₅₅ | 68.3 klm |