MR16 Below $10

"MR" stands for multifaceted reflector, a pressed glass reflector with the inside (reflecting side) surface composed of facets and covered by a reflective coating. A multifaceted reflector light bulb is a reflector housing format for halogen as well as some LED and fluorescent lamps.MR lamps are designated by symbols such as MR16 where the diameter is represented by numerals indicating units of eighths of an inch. MR16 (16⁄8 inches, 51 mm)