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| brightness | |||
| luminance (photometric brightness; the luminous intensity of any surface in a given direction per unit of projected area of the surface as viewed from that direction; units: expressed in candles per unit of area; stilb, sb: equal to 1 c/cm2, apostilb, asb: equal to 1/π • c/m²; lambert, L: equal to 1/π • c/cm²; foot-lambert, ft-L: equal to 1/π - c/ft²); photometric brightness; brightness (photometry) | |||
| luminance; surface brightness | |||
| Flächenhelligkeit: 2 phrases in 1 subject |
| Optics branch of physics | 2 |