Lighting Units For LED Indoor Lighting

The emergence of LED has broken the traditional design methods and ideas of light sources, and there are two latest design concepts.
Lighting unit
1. Luminous flux:
The energy radiated by a light source into the surrounding space per unit time and causing visual effects is called luminous flux, which is measured by Φ Represented in lumens (Lm).
2. Light intensity:
The luminous flux radiated per unit solid angle by a light source in a specific direction is called the luminous intensity of the light source in that direction, abbreviated as luminous intensity. Represented by symbol I, unit candela (Cd), I= Φ/ W.
3. Illumination:
The luminous flux received per unit surface area is called illuminance, expressed as E, in units of lux (Lx), E= Φ/ S
4. Brightness:
The luminous intensity per unit projected area of a luminous body in a given direction is called brightness, expressed in L, in 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 color temperature.
The direct conversion relationship of LED lighting unit price
The illuminance of a uniform distribution of light flux of 1 lux=1 lumen over an area of 1 square meter
1 lumen=the luminous flux emitted by a point light source with a luminous intensity of 1 candle per unit solid angle
1 lux=illumination generated by a point light source with a luminous intensity of 1 candle on a sphere with a radius of 1 meter