Figure 1. A comparison of light sources for building lighting (data from Lane, 2023; Mathias et al., 2023; Nair & Dhoble, 2021b; Xu, 2019).
| Light source type | Power rating (watts) | Luminous efficacy (lumens/watt) | Lifespan (hours) |
|---|---|---|---|
| Incandescent | 40–100 | 10–15 | 1,000 |
| CFL | 12–20 | 60–63 | 10,000 |
| LED | 4–10 | 110–150 | 25,000–100,000 |