Halogen MR16 Bulb
"MR" stands for multifaceted reflector, a pressed glass reflector with the inside (reflecting side) surface composed of facets and covered by a reflective coating. The "16" comes from 16 eighths of an inch in diameter at its largest circumference. These facets provide optical control by gathering the light from the filament to create a concentrated beam of light. LightbulbU offers a variety of MR16 lightbulbs to fit your needs.