Variants of a mold are catalogued separately, so each one has its own sets and minifigs. Check these too if something you expect is missing here.

• 266bc02 Light Brick 2 x 2 Type 2 12V with Red Diffusor this part is a alternate of it
• 266ac01 Light Brick 2 x 2 Type 1 12V (Complete) Mold of this part