Luminance Converter
Convert between various units of luminance (e.g., cd/m², nit, lambert, foot-lambert).
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Understanding Luminance
Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. It describes the amount of light that passes through, is emitted from, or is reflected from a particular area, and falls within a given solid angle.
The SI unit for luminance is candela per square meter (cd/m²), which is also known as a “nit”.
| Unit Name | Symbol | Relation to cd/m² (Approx.) |
|---|---|---|
| Candela/square meter (Nit) | cd/m² (nit) | Base unit (1 cd/m²) |
| Stilb (Candela/square centimeter) | sb (cd/cm²) | 10,000 cd/m² |
| Lambert | L | 3183.1 cd/m² (10000/π) |
| Foot-lambert | fL | 3.426 cd/m² |
| Apostilb (Blondel) | asb | 0.3183 cd/m² (1/π) |
| Candela/square foot | cd/ft² | 10.7639 cd/m² |