It's dark in the underhive. So I made a light. It uses 2 5mm LED's, a battery box, and an acrylic tube. You'll want to sand the tube down for the best effect.

For the tube I used part # 8532K16 https://www.mcmaster.com/acrylic/clear-scratch-and-uv-resistant-acrylic-tubes/

Battery Box.

https://www.amazon.com/Honbay-CR2032-Button-Battery-Holder/dp/B072L6DG6F/ref=pd_ybh_a_27?_encoding=UTF8&psc=1&refRID=VD56V7R04XY4Q6SE5GWQ