Luminous efficacy

The response of a typical human eye to light, as standardized by the CIE in 1924. The horizontal axis is wavelength in nm

Spectral radiance of a black body. Energy outside the visible wavelength range (~380–750 nm, shown by grey dotted lines) reduces the luminous efficiency.

Luminous efficacy is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power. 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.

单词	Lumens per watt
释义	Lumens per watt 原声例句 Did You Know? – Verge Science They can put out up to 100 lumens per watt. 它们可以输出高达每瓦 100 流明。 Did You Know? – Verge Science An equivalent CFL will get you way more, between 55 and 70 lumens per watt. 等效的 CFL 将为您提供更多，每瓦 55 至 70 流明。英语百科 Luminous efficacy Luminous efficacy is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power. 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.
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Lumens per watt

Luminous efficacy