Luminous efficacy
Photopic vision

Luminous efficacy

Section Title: Photopic vision
Table Section Text: None

Type	Luminous efficacy of radiation (lm/W)	Luminous efficiency

Tungsten light bulb, typical, 2800 K	15	2%

Class M star (Antares, Betelgeuse), 3000 K	30	4%

Black-body, 4000 K, ideal	54.7	8%

Class G star (Sun, Capella), 5800 K	93	13.6%

Black-body, 7000 K, ideal	95	14%

Black-body, 5800 K, truncated to 400–700 nm (ideal "white" source)	251	37%

Black-body, 5800 K, truncated to ≥ 2% photopic sensitivity range	292	43%

Black-body, 2800 K, truncated to ≥ 2% photopic sensitivity range	299	44%

Black-body, 2800 K, truncated to ≥ 5% photopic sensitivity range	343	50%

Black-body, 5800 K, truncated to ≥ 5% photopic sensitivity range	348	51%

Ideal monochromatic 555 nm source	683	100%

Sentence(s)

The photopic luminous efficacy of radiation has a maximum value of 683 lm/W in the case of monochromatic at 555 nm.

final_sentence: The photopic luminous efficacy of radiation has a maximum value of 683 lm/W in the case of monochromatic at 555 nm.