Cases/FAQ

[Illumination FAQ] 3 index of lighting —Stop asking series Vol.2

Hi everyone. In vol.2, we're going to talk about 3 major index of a lighting product, Lumen, Color Temperature, Color Rendering Index.

1. Lumen: It means how much light the lamp can produce.

Unit: lm (which is the abbreviation of Lumen).

Definition: Total luminous energy produced by the light.

Fluorescent light we normally uses produce about 1,000 Lm. Bulb is around 600~800 Lm.

Factory mostly uses light that produce above 3,000 Lm. Higher lumen output light are used for professional large range usage.

2. Color Temperature: Means the light that the lamp produced looks cold or warm.

Unit :Kelvin(°K)

Normally, we define 5,000K as white light. The light will turn orange if Color Temperature decreases.

It will turn black blue if increases. The More it changes, the more it become deeper.

				Metal halide lamp

				Thick fog day

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3. Color Rendering Index: CRI means, “Compare with sunlight, how close the color is shown under the light”. In other word, higher CRI can bring more vivid color for the object.

Unit: Ra. Take sunlight as Ra100. In general, normal LED lights can reach Ra70. It’s enough for normal use.

Higher requirement usually shows in place that need closer observation market or museum.