Luminous efficacy - Wikipedia
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).
PHIV | definition of PHIV by Medical dictionary
PHIV women started antiretroviral therapy earlier than BHIV women. Previous induced abortion tended to be more common in BHIV group, while previous spontaneous abortion was slightly …
White LED lights with 135 Lumens per Watt About Ten Times …
Aug 31, 2010 · The first was a white LED with a high luminous efficacy (ηL) of 249 lm W−1 and a high luminous flux (phiv) of 14.4 lm at a forward-bias current of 20 mA. This ηL was …
appropriate luminous efficiency functions for use in the mesopic region, where the eye’s sensitivity changes rapidly depending on the characteristics (level and spectral distribution) of the lighting …
The lumen seen in a new light: Making distinctions between light ...
Mar 31, 2014 · Thus, a given light source would generate a fixed amount of light (universal-lumens) or have a specific luminous efficacy (universal-lumens per watt) but since it can be …
PHIV | Article about PHIV by The Free Dictionary
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.
Improvement of Luminous Efficiency in White Light
Oct 1, 2007 · We fabricated three types of high luminous efficiency white light emitting diodes (LEDs). The first is the white LED, which had a high luminous efficiency (etaL) of 161 lm/W …
Luminous Efficacy and Efficiency - RP Photonics
Luminous efficacy: 0.072 · 683 lm/W · 453 mW / (3.2 V · 350 mA) = 19.9 lm/W, assuming photopic vision, where the response function delivers 0.072 at 455 nm. Remark: despite the …
Luminous intensity - Wikipedia
In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a …
Luminous flux - Wikipedia
The luminous flux is a weighted sum of the power at all wavelengths in the visible band. Light outside the visible band does not contribute. The ratio of the total luminous flux to the radiant …
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