Illumination

Definition: Represents the luminous flux received per unit area of the surface of the illuminated object. 1 Lux is equivalent to 1 lumens / square meter, that is, the luminous flux received by a light source with a distance of one meter and a luminous intensity of 1 cd per square meter of the illuminated object.

Illuminance (lm / m2) = luminous flux / irradiated area

For stage luminaires, both illuminance and luminous flux are units that characterize the brightness of the luminaire. Luminous flux refers more to the overall output of the luminaire, which is the sum of all light energy in the 4π solid angle range. Therefore, the luminous flux is more focused on spatial expression. Illuminance refers to the luminous flux per unit area of the luminaire, which is related to the actual test distance and spot size of the luminaire

In addition, for lamps with uniform output (such as pattern lamps, cutting lamps, etc.), lamps with uniformity of light spot greater than or equal to 0.9 can be roughly converted with the following relationship between luminous flux and illuminance:

Luminous Flux Φ = πr² * Center Illumination