A multifaceted reflector (usually abbreviated MR) mild bulb is a reflector housing format for halogen in addition to some LED and fluorescent lamps. MR lamps were initially designed for use in slide projectors, but see use in residential lighting and retail lighting as effectively. They're suited to functions that require directional lighting comparable to track lighting, recessed ceiling lights, desk lamps, pendant fixtures, landscape lighting, retail show lighting, and bicycle headlights. MR lamps are designated by symbols such as MR16 where the diameter is represented by numerals indicating units of eighths of an inch. Frequent sizes for general lighting are MR11 (11⁄8 inches, 35 mm) and MR16 (16⁄8 inches, fifty one mm), with MR8 (8⁄8 inch, 25 mm) and MR20 (20⁄8 inches, 64 mm) used in specialty applications. Many run on low voltage quite than mains voltage alternating current so require a power provide. 3,314,331 for a miniature reflector lamp in 1967. The innovation was utilizing the lamp rim, rather than the base, as the reference plane for focusing.

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