White lights are fine if you have the dimmer to control output on dark roads.
But around town with lots of ambient lighting .. white is better at a glance by a long way.
For the instrument pod switches, you strip the switch apart vertically and it reveals the soldered in led bulb.
I thought the switch face was screened with a green translucent colour, but looking through it it appears white.
So the LED may be green then, as sierrafery reckons.
I'll see if I can get some teeny white leds to play around with and reply back.
I tried to do white instrument dials, and if you use white leds, the green-ness of the dials and stuff come up more green than using green-screened incandescent bulbs!
The needles come up white tho.
I posted in the what happened to your D2 thread a while back, so may be hard to find those replies now .. I mucked about with different LED options for the dash gauges.
I got a few RGB(variable) LED globes, which use a wireless remote to change colours. Being RGB ...ie. not pure white LED chips .. but combining 3 leds to produce white(hence RG

.. they produced a really funky looking dash colour(s). was more multicoloured. Stupid phone cameras couldn't capture the reality of it.
The pure white LEDs just made the green brighter and more vivid.
So I'm curious how you planned to do the instrument cluster.
Climate control .. no worries. As it's an LCD, whatever colour lights you use will output that colour.
But the dash gauges are green screened.
So what happens, and hence why the RGB LEDs came into my thoughts ... if you (say) try red LEDs, the gauges come out orange coloured. Not bad, but not ideal.
If you try blue LEDs, the gauges turn out cyan .. and so on and so forth.
So be warned .. out on a dark road, LEDs will brighten the dash a bit too much .. which makes external viewing a bit less clear. It looks easy to add the dash resistor addition(found in the US and Japan models).
When I can be bothered and have time too (ie. stop feeling a bit lazy

) .. I'll do it to the D2 and post back on that too.
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