Convert Gigalumens to Watts (at 555 nm)
Convert Gigalumens (Glm) to Watts (at 555 nm) (W₅₅₅) instantly and accurately.
Conversion Formula
W₅₅₅ = Glm × 1464128.843
About Gigalumens
The gigalumen (Glm) equals 10⁹ lm. The scale for very large lighting installations and for theoretical comparisons: a large airport apron illuminated to 30 lx over 1 km² would require approximately 30 Glm of total installed luminous flux. The full-disk luminous flux of the Sun is approximately 3.6 × 10²⁸ lm. 1 Glm = 10⁹ 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
| Gigalumens (Glm) | Watts (at 555 nm) (W₅₅₅) |
|---|---|
| 1 Glm | 1464130 W₅₅₅ |
| 2 Glm | 2928260 W₅₅₅ |
| 5 Glm | 7320640 W₅₅₅ |
| 10 Glm | 14641300 W₅₅₅ |
| 25 Glm | 36603200 W₅₅₅ |
| 50 Glm | 73206400 W₅₅₅ |
| 100 Glm | 146413000 W₅₅₅ |