Both the LED industry and the traditional lighting industry have a lot to do with lighting technology. Lighting technology, like any other technology, has its own terminology. These special terms and concepts are used to define the characteristics of lamps and fixtures and to unify the units of measurement. Here are some important lighting terms.
Light and radiation : Light refers to the electromagnetic radiation that the human eye can perceive as bright, or the part of the entire electromagnetic radiation spectrum that can be seen by the human eye; this part has a wavelength distribution of 360 to 830 nm. It is only a very small part of the known spectrum of electromagnetic radiation.
Luminous flux (Φ) : unit: lumen (lm) All radiant energy emitted by a light source and perceived by the human eye is called luminous flux.
Luminous intensity (I): The amount of light flux in a solid angle in a certain direction. Unit: candela (cd) In general, the light source emits its luminous flux at different intensities in different directions. The intensity of visible light radiation emitted in a particular direction is called the light intensity.
Illuminance (E) : Unit: Lux (Lx, lx) Illuminance is the ratio of luminous flux to the surface being illuminated. The luminous flux of 1 lux with an illumination of 1 lumen is evenly distributed over an area of ​​one square meter.
Luminance (L): unit: candela per square meter (cdm2) The brightness of a light source or an illuminated surface refers to the light intensity density of a unit surface in a certain direction. It can also be said that the light source perceives the light source. Or the brightness of the face being illuminated.
Luminous efficacy (η) : unit: lumens per watt [lmW] represents the efficiency of the light source to convert the energy consumed into light
Color temperature (Co1or Temperature): unit: absolute temperature (Kelvin, K)
The color temperature of a light source is defined as the absolute temperature value of the black body radiator itself with the same light color, which can find its corresponding point on the Planckian trajectory on the chromaticity diagram. The higher the temperature of a standard black body, the more blue components in the spectrum of the emitted light, and the less red components. For example, an ordinary white heat bulb that emits a warm white color has a color temperature of 2700 K, and a neonescent fluorescent lamp has a color temperature of 6000 K.
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