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A multifaceted reflector (typically abbreviated MR) light bulb is a reflector housing format for halogen as well as some LED and fluorescent lamps. MR lamps had been initially designed for use in slide projectors, however see use in residential lighting and retail lighting as nicely. They're suited to functions that require directional lighting such as monitor lighting, recessed ceiling lights, desk lamps, pendant fixtures, panorama lighting, retail show lighting, and bicycle headlights. MR lamps are designated by symbols resembling MR16 the place the diameter is represented by numerals indicating items of eighths of an inch. Frequent sizes for basic lighting are MR11 (11⁄8 inches, 35 mm) and MR16 (16⁄8 inches, 51 mm), with MR8 (8⁄8 inch, EcoLight dimmable 25 mm) and MR20 (20⁄8 inches, sixty four mm) utilized in specialty purposes. Many run on low voltage moderately than mains voltage alternating present so require a power provide. 3,314,331 for a miniature reflector lamp in 1967. The innovation was using the lamp rim, reasonably than the bottom, because the reference aircraft for focusing.

This allowed extra flexible electrical mounting preparations and extra exact focusing. Most MR lamps consist of a halogen capsule (or, EcoLight bulb) built-in with a pressed glass reflector with a base conforming to bi-pin GU5.Three standard. The reflector controls the route and spread of gentle forged from the lamp. Some lamps use an aluminum coating as a reflector. Others use selective dichroic coating that displays visible light and permits infrared radiation to pass via. This type reduces heating of illuminated objects since less infrared radiation is current in the sunshine beam. However, dichroic lamps must solely be used in suitable fixtures that may dissipate the heat. Dichroic lamps must not be fitted to recessed or EcoLight smart bulbs enclosed luminaires with the IEC 60598 No Cool Beam symbol. The brightness of MR lamps can be adjusted when used with acceptable mild fixtures and dimmers. However, the color temperature modifications significantly when the lamp is dimmed, shifting dramatically to the hotter finish of the spectrum.

Like all halogen lamps, MR lamps produce important heat and care have to be taken to keep away from contact with skin or proximity to flammable supplies when the lamp is on or has been on just lately. Halogen lamps (18 lm/W typical) are more power environment friendly than regular incandescent lamps (15 lm/W typical) but still fall far behind different extra-current types resembling fluorescent lamps (80-a hundred lm/W), gasoline discharge lamps (100-200 lm/W depending on varieties), and LEDs (125-a hundred and fifty lm/W typical in bright white depending on type). With each forms of incandescent bulbs, useful life may be considerably shortened if their filaments expertise mechanical shock or vibration. Utilizing an electronic transformer with a tender start characteristic can significantly extend life, because it reduces the characteristically excessive inrush present that happens initially when the lamp is cold. Dimming also extends life significantly. MR lamps, EcoLight like all quartz-halogen lamps, produce some undesirable ultraviolet light. Normally, this must be filtered out.

Also, the quartz capsules of the lamps could rupture or explode upon failure of the lamps. For these two causes, some MR lamps embody a cover glass that serves as an integrated ultraviolet filter and explosion shield. MR16 lamps lacking this cowl require the use of a fixture that incorporates an external piece of glass particularly designed to provide each ultraviolet and physical protection. MR lamps can be found in 10-75 watt energy rankings (150-800 lumens). MR lamps most often operate at 12 volts, though they are additionally obtainable in other voltages. These lamps use a bi-pin connector for power: 12-volt MR11 bulbs often use a GU4 base, and 12-volt MR16 bulbs often use a GU5.Three base. The common 12-volt MR16 lamps, subsequently, require a ferromagnetic or digital transformer-typically misnamed as a ballast-to transform the 120- or 230-volt mains voltage to the extra-low voltage required by the lamp. Sure MR lamps can operate immediately on the mains voltage. These lamps typically use a GU10 flip-and-lock base, EcoLight outdoor in order that they can't be by chance interchanged with low-voltage lamps.

GU10 is distinguished from the lower-voltage MR lamps by the U-formed ceramic base mount with a ten mm (pin center-to-center distance) 2-pin bayonet mount. MR16 lamps with an integrated transformer are also out there. These lamps have screw bases to fit normal medium-base Edison sockets. MR lamps are generally out there in vary of shade temperatures, from about 2700 Ok to 7000 K, to fulfill numerous purposes. Retrofit lamps that generate light by a distinct precept but uses the MR type-issue can be found. For EcoLight outdoor instance, LED-primarily based MR16 lamps appear similar to halogen lamps and can be used in most fixtures designed for MR lamps. The identical is true of MR11-appropriate LED lamps. Fixtures designed for halogen MR16 or MR11 lamps that use digital transformers may should be retrofitted with LED-suitable transformers. There may be a wide variety of designs, varying significantly with regard to beam width, EcoLight outdoor mild color, effectivity and luminous power.