MR16 LED bulbs are an easy way to reduce energy usage in a variety of locations including track lighting, pendant lights, curio cabinets and display cases. LED MR16 bulbs utilize a bi-pin base for 12 volt applications or a GU10 base for 120 volt applications. MR16 bulbs with a GU10 base are often referred to simply as a GU10 bulb. Please see our GU10 category to view our selection of bulbs with this base style. MR16 bulbs measure two inches in diameter.