Color temperature
Express with absolute temperature K, when a standard
black object was heated, and along with the rise of
temperature, it
color changes for dark red to light red to yellow to
white to blue white and to blue.
Utilize this feature, when the color temperature of
some illuminant photochromic and black body is the
same at some
temperature, we call the temperature of this black
body the color temperature of this illuminant.
Color rendering index
An index that weighs the ability of a illuminant
shows the real color of the shined object, the
reshow of illuminant of color
rendering index (1-100) is more close to natural
color.
Rated average life
When a batch of lamps (enough quantity) were lighted
at standard state and requirements, 50% of them
failed and the other 50%
were still working, the accumulative working hours
are called rated average life.
Light efficiency
The efficiency of illuminant changes electricity
into visible light. Unit, lm/w, that is the light
gave out by consuming
one-watt electricity. The higher value means the
higher efficiency. Considered from economy, light
efficiency is an important
index.
