Multi color Led Lego. These can be run on AA batteries or a 120v adapter for the usb cord.
LEGO® Tree House 21318 Light Kit – Light My Bricks USA
Remote Control LED Light Kit for LEGO® Tree House (21318) – Toy
Shop Generic Mode Decoration Accessories LED Light kit For LEGO
LEGO Light Brick with Transparent Top and Orange LED Light (38625
LEGO 88005 LED Light - LEGO Power Functions - BricksDirect
LED Lighting Kit for LEGO Ideas The Flinstones set 21316 – Brick Loot
BrickBling LED Light for Lego Home Alone 21330
Old pre-LED light brick. : r/lego
LED Light Kit for Everyone is Awesome Compatible With LEGO® 40516
Double LED LEGO Street Lamp Post
LED Lighting Kit for LEGO Disney Train and Station 71044 – Brick Loot
LEGO® Star Wars UCS Millennium Falcon 75192 Light Kit – Light My
Electric, Light Brick 2 x 3 x 1 1/3 with Trans-Clear Top and
Pico LED Light Starter Kit