I would use LED lighting. Get a well diffused LED light and run it off the 12 VDC supply.
My $0.02...
Awesome! Thanks! I was considering 6000K so those look about right. How many do you think I will need for my chamber? I want it lit up pretty good on the inside.Something like this?
1.28US $ 14% OFF|2x 17cm Led Cob Bulb 12v 7000k Drl Car Styling Strip Waterproof Cob Led Working Light Driving Daytime Running Light Super White - Signal Lamp - AliExpress
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Also, do you know of a door plunger switch that would work? I'd need two of those....so that the lights come on with either switch.