Lighting the basics

First, the commonly used terms
Symbol Unit Description
Light and radiation
Light is electromagnetic radiation to the human eye, the optic nerve into the light, that part of theLED High Bay Light spectrum that can be seen by the naked eye. Such rays in the wavelength range between 360 ~ 830nm, only a very small part of the electromagnetic radiation spectrum.
The sum of the energy of the the flux Ф lumens the LM light source and the launch of the human eye is the luminous flux.
The light intensity of the light intensity I Kender cd, the radiation intensity of the visible light in a particular direction angle.
The illuminance E Lux Lux illumination is the coefficient of the ratio between the luminous flux and the illuminated area. 1Lux refers 1lm of the luminous flux is evenly distributed in the area of 1 m plane brightness.
Color temperature K Kelvin
(K) When the same color of the color of the light emitted by the light source and the blackbody radiation at a certain temperature, the temperature of the blackbody is referred to as the color temperature of the light source. "Blackbody" the higher the temperature, the more blue spectral component, while the red component, the fewer. For example: the incandescent light color is warm, the color temperature is 2700K, representation daylight fluorescent color temperature is 6000K. Color temperature to absolute temperature K, the higher the color temperature value, which means that cold sensation, the stronger, the lower the temperature warm sense of the stronger, more gentle, usually most of the light source designed to focus on the color temperature of 2700K to 4300K ​​and 5800K ~ 6700K two LED Bulb Light position.
Light shade color is actually the color temperature, is broadly divided into three categories: warm 3300K, intermediate color from 3300K to 5000K, daylight>
5000K, there is a difference in spectral composition due to light, even though the light color is the same as the CRI of the light may also be different.
CRI
Principle, artificial light with natural light, human eyes are able to correctly identify the color of things. Of course, depending on the location and purpose of the lighting. The light source for the extent to which the object represented by the color is called color rendering. Usually called "color rendering index (Ra)
Lighting efficiency luminaire efficiency (also called light output coefficient) is a measure of lighting energy efficiency standards, it is the ratio between the luminous ETL T5 LED Tube flux of the lamp output luminous flux lamps light output.Undo editsAlpha