I use some manually dimmable 12vdc undercabinet LED strips I got on Amazon about 15 years ago.
Usually what I recommend is some sort of LED that's dimmable and is very roughly 'white' spectrum; bonus points if it is IP rated for moisture and dust protection (though in a low voltage device this isn't really a safety issue so much as a hardware longevity issue). Some of the decision is based on how you have to mount the light (sit on top of screen, screw in from underneath, etc).
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