Views:2 Author:Site Editor Publish Time: 2017-06-30 Origin:Site
A multifaceted reflector (often abbreviated MR) light bulb is a reflector housing format for halogen as well as some LED and fluorescent lamps. MR lamps were originally designed for use in slide projectors, but see use in residential lighting and retail lighting as well. They are suited to applications that require directional lighting such as track lighting, recessed ceiling lights, desk lamps, pendant fixtures, landscape lighting, retail display 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. Common sizes for general lighting are MR16 (2 inches (51 mm)) and MR11 (1.375 inches (34.9 mm)), with MR20 (2.5 inches (64 mm)) and MR8 (1 inch (25 mm)) used in specialty applications. Many run on low voltage rather than mains voltage alternating current and require a power transformer in order to be correctly operated.
The MR16 lamp was first sold in 1965. Emmett H. Wiley of General Electric (USA) was awarded patent #3,314,331 for a miniature reflector lamp in 1967. The innovation was using the lamp rim, rather than the base, as the reference plane for focusing. This allowed more flexible electrical mounting arrangements and more precise focussing. Note that this lamp was not "multifaceted"; faceted reflectors were introduced in 1971.
MR lamps offer several advantages over other lamps with equivalent power ratings. They are typically smaller (transformers excepted), provide better beam control and offer a whiter light than ordinary incandescent lamps. The small size of the lamp allows designers more flexibility in placing the lamps and with the option of various beam widths, the light beam can be very specifically placed.
White LED MR lamps can be manufactured with different colour temperatures, normally ranging from warm whites, attempting to match the colour of halogens, all the way through to cool whites at 5500 K or more.
Another advantage is when used in 12 Volt Track Lighting systems the bare wires/connectors can be touched without fear of electrocution.
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