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LED colour temperature
Every colour is arranged by it’s temperature on the Kelvin scale. Daylight for example is defined as 5600 degrees Kelvin. De colour temperature determines if the lamp has warm colour or a cold, white colour. Low colour temperatures are perceived to be warmer than high colour temperatures. A few examples:
| Temperature |
Light source |
 |
| 1200 |
candle light |
| 2700 |
light bulb |
| 2800 |
halogen lamp |
| 4000 |
fluorescent lamp (840) |
| 5000 |
flash light (camera) |
| 5600 |
day light |
Lumoluce® offers a range of different colours for its products. The most common colours are “Cool white”, “Natural white” and “Warm white”. For some products the colours red, green and blue are optional as well. Custom colours are available in consultation with Lumoluce®. The colour temperatures for the shades of white we supply are the following:
| Cool white |
5000K - 6000K |
| Natural white |
4000K |
| Warm white |
2900K |
Sub Binning
A difficult aspect to control in LED production is colour. In a production of three thousand warm white LEDs, many LEDs will differ in colour shades. The cause of this problem can not yet be determined, but the difference in colour is quite significant. It can be disturbing if this difference is visible when lighting an area.
Lumoluce® has found a way to solve this problem. This method is called “sub binning”. In short, according to this method, every colour (in the example below cool white) is divided into four main shades (WG, WH, WD and WJ). These four shades will then be divided into nine sub shades (A-I). By means of an automatic measurement each LED gets a colour code that represents the exact colour shade. By using this method, customers always get the right colour when making a big order.
LED and UV radiation / infrared radiation
People always claim that LED light doesn’t contain infrared and ultraviolet radiation. Lumoluce’s policy is that they only confirm something when it is carefully studied. For this reason we did a spectral measurement on our LEDs to show the active wavelengths. This test shows that LED light contains no infrared radiation and ultraviolet radiation. Below you can find the data of the spectral Measurement.
LED 70 percent output
The “70 percent output” stands for the amount of light hours before the brightness of the LED lamp has decreased to 70 percent. Manufacturers usually don’t give this information, but Lumoluce does because only the best LED technology is used. The 70 percent output depends on the temperature of a LED. In a cool environment LED lights will last longer than in hot environments. Our reliability test (condition 10°C warmer than average) shows that after 20.000 light hours the output has decreased with 10 percent. The colour temperature changed only slightly.
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