RGB stands for red, green and blue.
These are the colours a RGB LED can mix to generate all colours. White is generated by mixing all colours at the same time.
This creates a poor quality white light and colour rendering.
RGB stands for red, green, blue and white. These are the colours a RGBW LED can mix to generate all colours. White is generated by a separate white LED. This creates a high quality white light and colour rendering.
Colour rendering (Ra)
Colour Rendering Index (CRI) - Ra
CRI is 50 Ra
CRI is 70 Ra
CRI is 90 Ra
Colour Rendering Index (CRI) is a general indicator of how “natural” object colours will appear when illuminated by a particular light source. Every colour temperature (Kelvin) can have the ideal value of Ra 100. This means that the colours are rendered in the typical manner for this temperature. This is not always satisfactory, however. For example an incandescent lamp (2700K) may render blue tones only in a subdued manner, despite an CRI of 99. If fine distinctions are required for blue tones a light colour with a higher colour temperature needs to be selected.
Luminous flux (lm)
Wattage VS Luminous Flux
200 - 300 Lm
300 - 500 Lm
500 - 800 Lm
700 - 1000 Lm
> 1000 Lm
Luminous flux (in lumens) is a measure of the total amount of light a lamp puts out. Wattage is the amount of watt a bulb uses in 1 hour.
We've long identified bulbs by their wattage, but that is actually a measure of electricity, not the brightness of a bulb. The amount of light a bulb generates is measured in lumens. An incandescent 60-watt bulb, for example, gives off 750 lumens of light and LED bulbs can deliver the same amount of light using as little as 9 Watt!
The amount of Lumen divided by the wattage will show you which lamps are most energy efficient.
Average lifetime (h)
Some bulbs or lamps contain a UV filter which prevents the discolouration of objects. This is due to their doped quartz glass which contains absorbent substances, that filter out most of the UV radiation emitted from the light.
Advantages of a UV filter:
Reduced bleaching caused by UV
Reduced discolouration caused by UV
Reduction of stress to material caused by UV within the bulb
It should be noted that as well as UV radiation, the visible light and infrared radiation can also cause undesirable changes, such as bleaching. As a result of this you should ensure that the light strength is adequate when used near any light sensitive materials.
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