luminous fluxunit：（Im）lumenLuminous flux is the total light a luminant emits.
light intensityunit： candela（cd）Luminous flux that a luminant emits in a unit solid angle at a certain direction.
illuminanceunit：（Im/m2）lumenLuminous flux that a luminant irradiates on a unit surface of an object.
BrightnessLuminous flux per unit surface that a luminant emits in a unit solid angle at a certain direction.
color temperature
Indicated with absolute temperature k (kelvin). A standard black object is heated. With the increased temperature, the object gradually changes in color: red→light red→orange→white→blue white→blue. With the change of light color, when the light color of the luminant is identical with the light color of the black object at a certain temperature, the absolute temperature of the black object is called the relevant color temperature of the luminant.
Display index (Ra)
Display index is the capacity parameter to measure how the luminant displays the real color of the object. The higher the display index (0~100),
The nearer the luminant displays the natural color of the object.
average life
Average life refers to the hours of a batch of lighted bulbs, 50% of which keep in good condition.
economic life
When the bulbs cannot emit light or when they cannot emit bright light, the hours by which the comprehensive light emission is reduced to a certain ratio is
called economic life.
photoelectric efficiency
Photoelectric efficiency refers to the efficiency at which a luminant transforms electricity into visible light. The unit is lumen/ watt (lm/w), the luminous flux em
itted by one watt electricity which is consumed by the luminant. The higher the number is, the higher the effect of the luminant. Photoelectric efficiency is
a key parameter to measure the economy of luminants. |
