Important lighting term analysis-1

Luminous flux: symbol Φ, unit lumens Lm, which indicates the sum of light emitted by the light emitter per second, that is, luminous flux

Intensity: Symbol I, unit candela cd, which shows the luminous flux emitted by a luminous body within a unit solid angle in a specific direction.

Illuminance: symbol E, unit Lux Lm/m2, indicating the flux of light emitted by the illuminator on the unit area of ​​the illuminated object

Luminance: Symbol L, unit nits cd/m2, indicating luminous flux per unit solid angle unit area in a specific direction

Light efficiency: unit lumens per watt Lm / w, indicating the ability of the electric light source to convert electrical energy into light, expressed as the luminous flux emitted divided by the power consumption