Additional links
Part description on:
Electric, Light Brick 12V 2 x 2 with 3 Plug Holes, Trans-Clear Diffuser Lens
Bricklink ID:08010bc01
Weight:2.800 g

Sets with this part (from Bricklink)
  Part color White

 Set nameRelease yearQuantity
50695069 2 Lighting Bricks 12 V19872
77457745 12 Volt High Speed Train19852
78677867 12v train light posts19834
77407740 Electric Inter-city train set, 12 V19802
78617861 Lighting Set (12 V)19804