Check out this nifty little USB 12 volt light. I installed a USB power device in the bottom of the bathroom cabinet so I can use the little guy as a night light. Should be just right and no more batteries.
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Speaking of under-cabinet lights, a cousin of mine recommended 12 volt semitrailer side marker lights (https://www.amazon.com/Mandark-LED-Trailer-Clearance-Waterproof/dp/B0DDC2QPJN). For $7.99 you can get ten (!) in your choice of white, amber, or red (for you astronomy buffs). Can't beat that price!