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Color Temperature (°K)
The "mood" of the light
Since we know that white is not equal to white, we use this unit to indicated white LEDs, because they don´t have an exact wavelength. The warmth white is as well known no color, but a total "reflection" of all spectral colors of the light.
A warm soft light, which a campfire or a candle radiates, produces another "mood" than e.g. the midday sun, the full moon or a fluorescent tube.
At the beginning each LED buyer should place itself the question: Which "mood" I would like to produce?
Do I need a strong, hard light around e.g. for a sculpture; Do I wish the same "mood" as my old bulb produce or do I need a soft but strong light for my bedside table. But how do I find the correct "mood" now?
The color temperature is a reference value!
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Source of light / Color temperature Candela 1.500 K Bulb (40 W) 2.680 K Bulb (60 W) 2.200 K Bulb (100 W) 2.800 K Bulb (200 W) 3.000 K Halogen lamp, fluorescent tube (warm white) 3.000 K Fotolamp Typ B, Halogen lamp 3.200 K Fluorescent tube (cold white) 4.000 K Xenon-Lamp, Lightbow 4.500-5.000 K Morning sun / Evening sun, 5.000 K Late morning sun / Early evening sun 5.500 K Electro flash 5.500-5.600 K Midday sun, Cloudy 5.500-5.800 K Daylight lamp 5.600-7.000 K Blue Sky 9.000-12.000 K Twilight, blue hour 10.000 K |
The color is the comparison of a black glowing titanium body(therefor, color temperature). Black has the temperature of 0°K (-273°C). Easily heating up the body he radiates within the infrared range. That´s the reason for it is that we can not recognize the heat development with the naked eye. UV light is swallowed by the eye lens.
With a further heating a body can accept the colors red, yellow, white and even blue. If thus for a white LED, a color temperature of 8 000°K is indicated, that is called nothing different, that a titanium body would have to be heated up to 8 000°K, in order to radiate this "color". 8.000°K would be a cold white-blue color. (see above graphic)
With white LEDS it is natural no reflection, but an output of all spectral colors (either by a mixture of several colors or by a partial transformation of blue into yellow light).
The international standard amount for middle sunlight (late morning and/or afternoon) is 5,500 Kelvin
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© Markus Kottas, Heldenberg Ltd.2010