Lego Electric Light Brick 2 x 3 x 1 1/3 WHITE top and Yellow LED 54930c02 | eBay
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LEGO light bricks – more options!
Lego Light Brick LED Electric 2x3x1 1/3 Trans-Red or Clear Top Christmas House | eBay
Electric, Light Brick 2 x 3 x 1 1/3 with Trans-Clear Top and Yellow LED Light (Glows Orange) : Part 54930c02 | BrickLink