🖥️ Display Technology & Photometry
Luminance (Nits vs Foot-Lambert) Converter
Convert surface emitted brightness ($L_v$) across $\text{Nits}$ ($\text{cd/m}^2$), $\text{Foot-Lamberts}$ ($\text{fL}$), $\text{Lamberts}$ ($\text{L}$), $\text{Stilbs}$ ($\text{sb}$), and $\text{Apostilbs}$.
🎬 Cinema Screen (14 fL)
🖥️ Office Monitor (350 Nits)
📺 HDR OLED (1,000 Nits)
📱 Phone Sunlight (2k Nits)
Input Luminance Value
Standard Foot-Lamberts (fL)
291.86 fL
Nits (cd/m²)
1,000 Nits
Stilb (sb)
0.1000 sb
Apostilb (asb)
3,141.6 asb
💡 Luminance Equivalence:
$$1\text{ Foot-Lambert (fL)} \approx 3.42626\text{ cd/m}^2\text{ (Nits)} \implies 1\text{ Nit} = 1\text{ cd/m}^2$$
Understanding Display Luminance (Nits & Foot-Lamberts)
Luminance ($L_v$) is the photometric measure of the luminous intensity per unit area of light travelling in a given direction:
- Definition: $$L_v = \frac{d^2\Phi_v}{dA \cos\theta d\Omega}$$
- Nits: 1 Nit is identical to $1\text{ Candela per square meter (cd/m}^2\text{)}$.
- Foot-Lamberts in Cinema: The Society of Motion Picture and Television Engineers (SMPTE) standard cinema screening brightness is $14 \pm 2\text{ fL}$ ($\approx 48\text{ Nits}$).
- Conversion Factor: $1\text{ fL} = 3.426259\text{ Nits (cd/m}^2\text{)}$.