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 Light Source Items
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Luminous Flux: |
Light energy produced by light source in unit time. |
Unit:Lm |
Luminosity: |
Strength of light;volume of light produced in certain direction angle. |
Unit : Cd |
Illumination: |
Volume of light in unit area (light beam/area (m2)); to show brightness in certain places. |
Unit : Lux |
Luminance: |
To show luminance degree of objects or light sources; light degree in unit orthograph area. |
Unit : Nit, Cd/m2 |
Chroma: |
Measurement to describe color vision influence strength of human eyes. |
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Color Rendering: |
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- Color rendering is the truthfulness percentage of reception under light source and under sunlight
- Light source with high color rendering reveals more distinctive and objects are more close to nature in human eyes.
- Measurement standard sets natural light Ra-100 as 100% true color.
- Manmade light source - color truthfulness is 90% (Ra-90)compared to natural light in proper color temperature.
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Color Temperature: |
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- Degree of photochromic of light source; while heating standard blackbody (i.e.Fe), photochromic will change with temperature increasement,from red, orange, yellow, yellow white, white till blue white.
- When blackbody is heated near or to the same temperature of light source, it is defined as color temperature of this light source, K as unit.
- When blackbody is heated to be red, the temperature is approximately 527℃,（800K）. The higher color temperature is, the closer photochromic is to green white, which brings cool environment.
- The lower color temperature is, the closer photochromic is to red and yellow, which brings warm environment.
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Color Temperature |
Photochromic |
20000~25000K |
fine bluesky light |
6000K |
fine daylight sunshine on plateau |
5300K |
cloudy daylight sunshine |
5000~4000K |
cold fluorescent lamp |
4600~4000K |
compound metal lamp |
4100K |
full moon |
3750~3450k |
mercury lamp |
3000K |
halogen lamp |
3000K~2500K |
warm color fluorescent lamp |
2700K |
tungsten lamp |
2250~1950K |
high-pressure sodium lamp |
2000K |
candle |
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Lighting Efficiency（lm/W） Compare & Contrast |
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CCFL
Reference：
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1、
Natural Light Spectrum Distribution:
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2、
CIE 1931 chromaticity diagram:
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3、
Electrode Evolution:
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Spectrum distribution diagram records energy situation of light source in different wavelength. |
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If model of color powder is fixed, width and center cannot be changed. Only
lighting energy can be changed with different weight of R,G and B. |
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4、
Electrode Evolution:
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5、 Electrode Evolution: |
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