The MR20 light bulb is similar looking like MR16 light bulb, but different fitting. The fitting is GU10, and diameter is 50mm. It comes in halogen and LED type. It is 240V light bulb, when compare to MR16 is 12V. In some cases, the tall of MR20 light bulb is an important fact when chose replacement. Ensure the tall is similar or not taller then original one.