MR16 bulbs with a GU10 base are often referred to simply as a GU10 bulb. LED MR16 bulbs are available with a bi-pin base for 12 volt applications or a GU10 base for 120 volt applications. GU10 LED bulbs are an easy way to reduce energy usage in line voltage track lighting, pendant lights, curio cabinets and display cases. Please see our MR16 LED Bulbs category to view our selection of low voltage LED MR16 bulbs. The MR16 bulb in either base style measures two inches in diameter.