There are 4 terms related to efficiency: light source efficiency, lamp efficiency, whole lamp efficiency, light efficiency.

Do you understand? Let’s look at them one by one:

First, the light source is energized and emitted. The ability of a light source to convert electricity into light is “luminous efficiency”, referred to as “light efficiency”. If it refers to the light source itself, it can also be called “light source light effect”, Xiaobian abbreviates him as “light source efficiency”, uh… Count him passable.

Secondly, the light source is not “naked”, it must be equipped with lamps, through reflectors, lenses, hoods.

There will be a loss, and the light coming out of the lamp will definitely not be as much as before.

The light emitted by the light source overcomes thorns! Kill the lamps! How much is left? This survival rate is the “lamp efficiency”.

Okay, we’ve learned two terms about efficiency, and to stack them up, what is that?

The ability of the entire lamp to convert electricity into light.

This is the “lamp efficiency”, which can be commonly called “whole lighting effect”.

Finally, an excerpt from the normative definitions of these terms in the Chinese national standards. It is worth noting that in the upcoming 2013 new version of the Chinese national standard, the two concepts of “efficiency” and “efficiency” are separated.

Well, this is good, and everyone will not make mistakes in the future.

“Architectural Lighting Design Standard GB50034-2004”:

luminous efficiency luminous efficiency (of a lamp): the luminous flux of the lamp and the quotient of the electrical power consumed by the lamp, the unit is lm/W.

Luminaire efficiency uminarie efficiency: Under the same use conditions, the total luminous flux emitted by the lamp is

ratio to the total luminous flux emitted by all light sources in the lamp, also known as the luminous output ratio of the lamp.

“Architectural Lighting Design Standard GB50034-2013 (Draft for Comments)”:

luminous efficacy of light source: The luminous flux emitted by the light source divided by the power of the light source is obtained, referred to as the light effect of the light source. The unit is lumens per watt (m/W).

luminaire efficiency: Under specified conditions of use, the ratio of the total luminous flux emitted by the luminaire to the total luminous flux emitted by all light sources in the luminaire is also known as the luminaire light output ratio.

luminaire efficacy: Under specified use conditions, the ratio of the total luminous flux emitted by the lamp to the power consumed by the lamp is lm/W.

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