Multi color Led Lego. These can be run on AA batteries or a 120v adapter for the usb cord.
Remote Control LED Light Kit for LEGO® Tree House (21318) – Toy
LEGO Lego Iconic, Ghost Key Chain W/led Light, H - Bags
LED Light Kit for Gingerbread House Compatible With LEGO® 10267
Led Light Kit for Legos Santa's Visit, Light Set Compatible with
LEGO Banana Guy LED Light
Lightailing LED Light Set for LEGO 75313 Star Wars AT-AT — Brick-a
LIGHTAILING Led Lighting Kit for Legos Police Station 10278
LIGHTAILING Led Light for Lego 71395 Question Mark
Lightailing LED Light Kit for LEGO Creator Expert 10269 Harley
Electric, Light Brick 2 x 3 x 1 1/3 with Trans-Clear Top and
LocoLee LED Light Kit for LEGO® Gabby's Dollhouse 10788 – My Store