Luminous Flux Converter

Convert between all luminous flux units instantly. Select your units from the dropdowns below and enter a value to see the conversion in real-time.

SI unit: lumen (lm)

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Conversion Formula

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Select units above to see detailed information about them.

1 lm = 1 cd·sr (SI derived unit definition)
1 W (at 555 nm) = 683 lm (exact - 2019 SI definition; K_cd = 683 lm/W at 540 THz)
Standard wax candle: ~12 lm total output
40 W incandescent bulb: ~450 lm; 60 W: ~800 lm; 100 W: ~1 600 lm
800 lm LED lamp (standard 60 W replacement): ~9-10 W input
150 W PAR38 halogen flood: ~2 000 lm (~2 klm)
1 000 W high-pressure sodium street lamp: ~130 000 lm (~130 klm)
LED stadium floodlight array (full pitch): 1-10 Mlm
Total luminous flux of the Sun: approximately 3.6 × 10²⁸ lm
Luminous flux from intensity: Φ = I × Ω (lm = cd × sr)