[loo-muh-nos-i-tee] 
| 1. | luminance (def. 2). |
| 2. | the quality of being intellectually brilliant, enlightened, inspired, etc.: The luminosity of his poetry is unequaled. |
| 3. | something luminous. |
| 4. | Astronomy. the brightness of a star in comparison with that of the sun: the luminosity of Sirius expressed as 23 indicates an intrinsic brightness 23 times as great as that of the sun. |
| 5. | Also called luminosity factor. Optics. the brightness of a light source of a certain wavelength as it appears to the eye, measured as the ratio of luminous flux to radiant flux at that wavelength. |
[loo-muh-nuh
ns] | 1. | the state or quality of being luminous. |
| 2. | Also called luminosity. the quality or condition of radiating or reflecting light: the blinding luminance of the sun. |
| 3. | Optics. the quantitative measure of brightness of a light source or an illuminated surface, equal to luminous flux per unit solid angle emitted per unit projected area of the source or surface. |
| lu·mi·nos·i·ty (lōō'mə-nŏs'ĭ-tē) n. pl. lu·mi·nos·i·ties
|
luminance (l 'mə-nəns) Pronunciation Key
The luminous intensity of a light source per unit area. Occasionally the lambert unit is used to measure luminance. Also called photometric brightness. |
