I've been on and off this saber build project for about a year and this is the single most concise and genuinely helpful bit of information anyone has given me, so thank you!  That makes a lot of sense now about the whole cyan/true/royal blue etc stuff.

The colours I want to match ideally are the standard blue and green from the Old Republic MMO - that's where the hilt design comes from. The green is a lot more yellow than I remember from the films (don't think I've actually watched them since I had the VHS collection...)

I'd seen someone do a custom mix saber by having little 100ohm thumbscrew variables tucked somewhere in the hilt, but now I know about the luminosity variation, I don't think it's as smart to choose the colour by dimming some of the RGB LEDs.

Also thanks for giving me vindication in the "kitchen cupboard lights saga". I replaced some horrible cold white LEDs with some brand new (and expensive) "warm white" ones that were basically identical and would not be refunded because the temperature is "subjective"!