if those are the same fixtures as my 2014 E21 has, I slid the clear lens cover off, and cut some red Rubylith film to nicely fit on the inside of the lens, then replaced the lens, to make one of them red for star parties, you could do the same with some frosted gel material to diffuse the light.....
I later replaced this with an amber/yellow LED to use as a night light. the other half of that fixture still has the original white light, so if I switch it on 'both', then its plenty brigth white.
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