It is known that light is light, but it turns out that there is a very big difference between them.

The popular parameters are:
light temperature – KELVIN
brightness – LUMENS
current consumption – WATS

But there is another index that is rarely talked about:
CRI index (Colour Rendering Index) – naturalness of light – RA

Photo from Wikipedia

As you can see in the photo, only an incandescent lamp provides 100% of the color spectrum. Any other light works more on the RGB principle by drawing only 3 color lines. Thanks to the incomplete spectrum, the economy of consumption is obtained. By using a partial spectrum light source, you are practically in the dark even when you are in a bright room.

Only sunlight, candles and incandescent bulbs reach the 100RA index – NATURAL LIGHT

That’s why we use direct current and incandescent bulbs for all our lighting.


In the diagram, you can see how sunlight and incandescent light emit a full spectrum, and LED bulbs emit RGB (Red, Green, Blue) light pulses, which the human eye perceives as white light. LED light is more economical due to the fact that it does not emit the full spectrum. It is beneficial for technical rooms and portable flashlights because the power batteries can ensure a longer operating time and the light element can illuminate a wider area, but it is not suitable for living spaces because the person is in a quite dark room, although the eyes recognize the room as bright. During the dark time of the day, the body does not receive enough energy of light.

The LED light in slow motion. RGB you actually see as white, looks image above.
The principle is similar to monitors. If you look at the white area of the monitor with a powerful magnifying glass, you will see 3 colored light pixels – Red, Green and Blue.

Reed more about RGB on Wikipedia

CRI index shows how close to natural light is. Light sources close to natural are used in museums – usual 96 – 98RA. Incandescent bulbs – 100RA are often used in elite areas. Contact us if you have questions about light and electricity.