Additional links
Part description on:
Electric, Light Brick 4.5V 2 x 2 with 2 Plug Holes, Trans-Clear Smooth Lens
Bricklink ID:08010cc01
Weight:2.800 g

Sets with this part (from Bricklink)
  Part color Yellow

 Set nameRelease yearQuantity
11151115 Lighting Brick, 4.5V19801
970970 Lighting Bricks19782

  Part color Red

 Set nameRelease yearQuantity
995995 Lighting set19692