Luminous Flux Calculator
Power (Watts)
Efficacy (lm/W)
Luminous flux (lumens) is the total perceived light output. Luminous efficacy (lm/W) measures how efficiently electricity is converted to visible light. LED: 80–120+ lm/W vs incandescent: ~15 lm/W.
- 1Lumens = Watts × Efficacy (lm/W)
- 2Higher lumens = brighter light
- 3Higher lm/W = more efficient; lower running cost
- 4800 lumens ≈ old 60W incandescent brightness
10W LED, 100 lm/W efficacy=1,000 lumens — equivalent to ~75W incandescent
| Room | Target lumens |
|---|---|
| Bedroom | 1,500–3,000 |
| Living room | 1,500–3,000 |
| Kitchen | 3,000–6,000 |
| Office | 3,000–6,000 |
| Bathroom | 4,000–8,000 |
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