LEGO part 4771 - White Electric, Light Brick 1 x 4 with Twin Top Lights at BrickScout
LEGO® Disney Castle 71040 Light Kit – Light My Bricks USA
Amazon.com: Sawaruita Light Up Building Bricks Multicolor LED Light Brick Sets Classic Transparent 2x2 2x3 Building Block Accessories Kit Toys Compatible with All Major Brands : Toys & Games
LEGO PART 62930 Light Brick 2 x 3 x 1 1/3 with Dark Bluish Gray Base [Yellow LED] | Rebrickable - Build with LEGO