What does Lux mean?

LUX is illuminance, or illuminance for short.

The unit of measurement is called lux, and the unit symbol is lx, which represents the luminous flux per unit area of the surface of the object being photographed.

1 lux is equal to 1 lumen/square meter, that is, the luminous flux vertically irradiated by a light source with a luminous intensity of 1 Candeira at a distance of one meter per square meter from the subject. Illuminance is an important index to measure the shooting environment.

Calculation formula:

Average illuminance (Eav) = total luminous flux of light source (n * Ф) * utilization coefficient (CU)* maintenance coefficient (MF)/ area (㎡).

(Suitable for indoor or stadium lighting calculation)

Utilization coefficient: indoor 0.4, exercise 0.3.

Maintenance coefficient: generally 0.7 ~ 0.8.

Example 1:

Indoor lighting: 4× 5m room, 9 sets of 3×36W grid lights.

Average illuminance = total luminous flux of light source ×CU×MF/ area = (2500× 3× 9 )× 0.4× 0.8 ÷ 4 ÷ 5 =1080lux.

Conclusion: The average illumination is above 1000Lux.

Example 2: Gymnasium lighting: 20× 40m stadium, using 60 sets of powerspot 1000 w metal halide lamps.

Average illuminance = total luminous flux of light source ×CU×MF/ area = (105000× 60) × 0.3× 0.8 ÷ 20 ÷ 40 =1890lux.

Conclusion: The average horizontal illumination is above 1500 Lux.