| 单词 | luminous efficacy |
| 释义 | luminous efficacy [`lü·mǝ·nǝs ´ef·ǝ·kǝ·sē] OPTICS 1. The ratio of the total luminous flux in lumens emitted by a light source over all wavelengths to the total radiant flux in watts.Formerly known as luminous efficiency. 2. The ratio of the total luminous flux emitted by a light source to the power input of the source; expressed in lumens per watt. |
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