Luminous efficacy | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-27

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Luminous_efficacy


00:01:10 1 Efficacy and efficiency
00:01:46 2 Luminous efficacy of radiation
00:01:56 2.1 Explanation
00:03:41 2.2 Mathematical definition
00:05:08 2.3 Examples
00:05:15 2.3.1 Photopic vision
00:05:24 2.3.2 Scotopic vision
00:05:38 3 Lighting efficiency
00:05:51 3.1 Examples
00:07:12 4 SI photometry units
00:08:40 5 See also
00:08:50 6 Notes



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SUMMARY
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Luminous efficacy is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power, measured in lumens per watt in the International System of Units (SI). Depending on context, the power can be either the radiant flux of the source's output, or it can be the total power (electric power, chemical energy, or others) consumed by the source.
Which sense of the term is intended must usually be inferred from the context, and is sometimes unclear. The former sense is sometimes called luminous efficacy of radiation, and the latter luminous efficacy of a source or overall luminous efficacy.Not all wavelengths of light are equally visible, or equally effective at stimulating human vision, due to the spectral sensitivity of the human eye; radiation in the infrared and ultraviolet parts of the spectrum is useless for illumination. The luminous efficacy of a source is the product of how well it converts energy to electromagnetic radiation, and how well the emitted radiation is detected by the human eye.