Bril (unit)
# Bril (unit)

The bril is an old, non-SI, unit of luminance. The SI unit of luminance is the candela per square metre.

## Unit conversions

Units of luminance :

| vte | vte | $cd/m^2$ (SI unit) ≡ nit ≡ $lm/m^2/sr$ | stilb (sb) (CGS unit) ≡ $cd/cm^2$ | apostilb (asb) ≡ blondel | bril | skot (sk) | lambert (L) | foot-lambert (fL) = 1 ⁄ π $cd/ft^2$ |
| - | - | - | - | - | - | - | - | - |
| 1 $cd/m^2$ | = | 1 | $10^{−4}$ | π ≈ 3.142 | $10^7$ π ≈ $3.142×10^7$ | $10^3$ π ≈ $3.142×10^3$ | $10^{−4}$ π ≈ $3.142×10^{−4}$ | $0.3048^2$ π ≈ 0.2919 |
| 1 sb | = | $10^4$ | 1 | $10^4$ π ≈ $3.142×10^4$ | $10^{11}$ π ≈ $3.142×10^{11}$ | $10^7$ π ≈ $3.142×10^7$ | π ≈ 3.142 | $30.48^2$ π ≈ 2919 |
| 1 asb | = | 1 ⁄ π ≈ 0.3183 | $10^{−4}$ ⁄ π ≈ $3.183×10^{−5}$ | 1 | $10^7$ | $10^3$ | $10^{−4}$ | $0.3048^2$ ≈ 0.09290 |
| 1 bril | = | $10^{−7}$ ⁄ π ≈ $3.183×10^{−8}$ | $10^{−11}$ ⁄ π ≈ $3.183×10^{−12}$ | $10^{−7}$ | 1 | $10^{−4}$ | $10^{−11}$ | $0.3048^2×10^{−7}$ ≈ $9.290×10^{−9}$ |
| 1 sk | = | $10^{−3}$ ⁄ π ≈ $3.183×10^{−4}$ | $10^{−7}$ ⁄ π ≈ $3.183×10^{−8}$ | $10^{−3}$ | $10^4$ | 1 | $10^{−7}$ | $0.3048^2×10^{−3}$ ≈ $9.290×10^{−5}$ |
| 1 L | = | $10^4$ ⁄ π ≈ 3183 | 1 ⁄ π ≈ 0.3183 | $10^4$ | $10^{11}$ | $10^7$ | 1 | $0.3048^2×10^4$ ≈ 929.0 |
| 1 fL | = | 1 ⁄ $0.3048^2$ ⁄ π ≈ 3.426 | 1 ⁄ $30.48^2$ ⁄ π ≈ $3.426×10^{−4}$ | 1 ⁄ $0.3048^2$ ≈ 10.76 | $10^7$ ⁄ $0.3048^2$ ≈ $1.076×10^8$ | $10^3$ ⁄ $0.3048^2$ ≈ $1.076×10^4$ | $10^{−4}$ ⁄ $0.3048^2$ ≈ $1.076×10^{−3}$ | 1 |
