Some cheap usb rechargeable motion activated closet lights. Should work OK as they are mounted away from water exposure.
Closet Light, SLBFO 10 LED Motion Sensor Light Operated Wireless Motion Sensor light Portable Magnetic Stick Up Closet Light for Closets Bathroom Stairway and More Place (2 Pack) https://www.amazon.com/dp/B075N2XVBP..._LfuoAb1R3C1DD
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