1. Luminous flux:
The energy emitted by a light source into the surrounding space per unit time and causing visual perception is called luminous flux Φ Represented in lumens (Lm).
2. Light intensity:
The luminous flux radiated by a light source in a specific direction within a unit solid angle is called the luminous intensity of the light source in that direction, which is called light intensity for short. Represented by the symbol I, in candela (Cd), I= Φ/ W 。
3. Illuminance:
The luminous flux accepted on the unit plane path is called illuminance, expressed in E, and the unit is lux (Lx), E= Φ/ S .
4. Brightness:
The luminous intensity of the illuminant on the unit projection area in the given direction is called brightness, which is expressed in L, and the unit is candela per square meter (Cd/m).
5. Color temperature:
When the color emitted by a light source is the same as the color emitted by a blackbody heated to a certain temperature, it is called the color temperature of the light source, abbreviated as the color temperature.
The direct conversion relationship of LED lighting unit price
The luminous flux of 1 lux=1 lumen is evenly distributed over an area of 1 square meter
1 lumen=luminous flux emitted by a point light source with luminous intensity of 1 candle in unit solid angle
1 lux=illuminance generated by a point light source with luminous intensity of 1 candle on a sphere with a radius of 1 meter