What are the basic lighting terms for LEDs?

A : Common lighting terminology luminous flux:   symbol   Φ, unit   Lumens Lm, description   The sum of the amount of light emitted by the illuminator per second, ie the luminous flux

Light intensity: symbol I , unit   Candela cd , description   Luminous flux emitted by a illuminator within a solid angle of a specific direction unit

Illuminance: symbol E , unit   Lux Lm/m2 , description   The luminous flux of the illuminant on the unit area of ​​the illuminated object

Brightness: symbol L , unit   Nitta cd/m2 , description   Luminous flux in a unit of solid angle unit area in a particular direction

Light efficiency: unit   Lumens per lumen watt Lm/w   The ability of an electric light source to convert electrical energy into light, expressed as the amount of luminous flux divided by the amount of electricity consumed.

Average life: unit   Hour, description   Refers to the number of hours when a batch of bulbs is damaged to 50%.

Economic life: unit   Hour, description   While considering damage and attenuated beam output health bulb at its output beam reduced synthesis of a particular number of hours. This ratio is 70% for outdoor light sources and 80% for indoor light sources such as fluorescent lamps .

Color temperature : When the color of the light emitted by the light source is the same as that of the black body at a certain temperature , the temperature of the black body is called the color temperature of the light source .

The color temperature of the light source is different , the light color is also different , the color temperature is below 3300K, there is a stable atmosphere , the feeling of warmth; the color temperature is 3000--5000K for the intermediate color temperature , and there is a refreshing feeling; the color temperature has a cold feeling above 5000K . Different light sources The light color constitutes the best environment , as shown in the table:

Color temperature >5000k: light color is cool (white with blue) , cold atmosphere effect;

Color temperature is 3300-5000K : light color is   Middle ( white ) , refreshing atmosphere effect;

Color temperature <3300K : light color is   Warm ( with red white ) , a steady atmosphere effect .