💡 Photometry & Lighting Efficacy
Luminous Flux (Lumens vs Candlepower) Converter
Convert total emitted visible light energy ($\Phi_v$) across Lumens ($\text{lm}$), Spherical Candlepower ($\text{MSCP}$), Hefnerkerze, and $\text{Talbots}$.
🕯️ Wax Candle (12.57 lm)
💡 60W Equiv (800 lm)
🔆 100W Equiv (1,600 lm)
🚗 Car Headlight (4k lm)
🏟️ Stadium Floodlight
Input Luminous Flux
Standard Lumens (lm)
800.0 lm
MSCP
63.66 CP
Kilolumens
0.800 klm
Hefnerkerze
886.0 HK
💡 Luminous Flux Relationship:
$$1\text{ MSCP} = 4\pi\text{ Lumens} \approx 12.5664\text{ lm} \implies 800\text{ lm} \approx 63.66\text{ MSCP}$$
Understanding Luminous Flux
Luminous flux ($\Phi_v$) measures the total perceived power of light emitted in all directions, weighted by human spectral sensitivity ($V(\lambda)$):
- Relation to Intensity: $$\Phi_v = \int I_v d\Omega \implies \Phi_{\text{isotropic}} = 4\pi I_v$$
- Luminous Efficacy: Modern LEDs generate $90 - 150\text{ lm/Watt}$, whereas traditional tungsten incandescent lamps yielded only $12 - 15\text{ lm/Watt}$.
- Mean Spherical Candlepower (MSCP): $1\text{ MSCP} = 4\pi\text{ Lumens} \approx 12.56637\text{ lm}$.