Important lighting term analysis-2

Life expectancy: unit hours, indicating the number of hours that a batch of light bulbs is damaged by 50 percent

Economic life: in hours, which means that considering the damage of the bulb and the attenuation of the beam output at the same time, the combined beam output is reduced to a certain number of hours. This ratio is used for 70 percent of the outdoor light source and is used indoors. 80% of light sources such as fluorescent lamps.

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

Light source color temperature is different, light color is also different, color temperature below 3300K has a stable atmosphere, warm feeling; color temperature in the 3000 - 5000K as the middle color temperature, there is a refreshing feeling; color temperature above 5000K has a cold feeling. Different light source different Light color constitutes the best environment, as shown in the table:

Color temperature> 5000k: Light color is cool type (blue with white), cold atmosphere effect;
Color temperature 3300-5000K: light color is in the middle (white), refreshing atmosphere effect;
Color temperature <3300K: Light color is warm (red with white), stable atmosphere effect

a. Color temperature and brightness Under high color temperature light source illumination, if the brightness is not high, it gives people a chi atmosphere; under the low color temperature light source, the high brightness will give people a kind of sultry feeling.
b. Contrast of light color In the same space, two kinds of light sources with large differences in light color are used, and the contrast will have a gradation effect. When the light color contrast is large, the light level can be obtained while obtaining the brightness level.