On 03/10/2019 17:03, Max Demian wrote:

snip

You can have red, green and blue LEDs to make up white...

They make something which looks white for many or maybe most purposes,
but they don't make white. They don't make anything above blue, so no
violet, and nothing below 'normal' red, so no deep red, and there are
significant gaps between the colours.

Cheers
--
Clive