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Lighting terminology

1, luminous flux φ unit lumen [LM];

Light and the human eye receives energy sum is the luminous flux (φ).

2, light intensity l unit: candela [CD];

In General, the light is in different directions and different intensity. Visible light emission intensity in a particular direction angle is called the light intensity (l).

3, illuminance e units: Lux [LX]; coefficient of the ratio between the luminous flux with the illuminated area.

LX the 1lm distribution of luminous flux average brightness in the area of LM2.

4, luminance l unit: candela/square meter [CD/m2];

Eye see objects reflected light intensity in one direction.

5, the light effect units: lumens per watt [LM/w];

The efficiency of electric energy into light.