A multifaceted reflector (usually abbreviated MR) gentle bulb is a reflector housing format for halogen as well as some LED and fluorescent lamps. MR lamps were initially designed to be used in slide projectors, however see use in residential lighting and retail lighting as effectively. They're suited to applications that require directional lighting corresponding to monitor lighting, EcoLight recessed ceiling lights, desk lamps, pendant fixtures, panorama lighting, retail show lighting, and bicycle headlights. MR lamps are designated by symbols similar to MR16 where the diameter is represented by numerals indicating units of eighths of an inch. Frequent sizes for basic 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, sixty four mm) utilized in specialty applications. Many run on low voltage moderately than mains voltage alternating present so require a energy provide. 3,314,331 for a miniature reflector lamp in 1967. The innovation was utilizing the lamp rim, somewhat than the base, as the reference airplane for focusing.

This allowed extra versatile electrical mounting arrangements and EcoLight lighting more exact focusing. Most MR lamps consist of a halogen capsule (or, bulb) integrated with a pressed glass reflector with a base conforming to bi-pin GU5.Three customary. The reflector controls the route and unfold of mild forged from the lamp. Some lamps use an aluminum coating as a reflector. Others use selective dichroic coating that reflects seen gentle and permits infrared radiation to move through. This kind reduces heating of illuminated objects since much less infrared radiation is current in the light beam. Nonetheless, EcoLight LED dichroic lamps should solely be used in appropriate fixtures that can dissipate the heat. Dichroic lamps should not be fitted to recessed or enclosed luminaires with the IEC 60598 No Cool Beam symbol. The brightness of MR lamps may be adjusted when used with appropriate gentle fixtures and dimmers. Nonetheless, the shade temperature modifications significantly when the lamp is dimmed, shifting dramatically to the hotter finish of the spectrum.

Like all halogen lamps, MR lamps produce significant heat and care should be taken to avoid contact with skin or proximity to flammable supplies when the lamp is on or EcoLight LED has been on lately. Halogen lamps (18 lm/W typical) are extra power environment friendly than common incandescent lamps (15 lm/W typical) however still fall far behind other more-current sorts akin to fluorescent lamps (80-a hundred lm/W), fuel discharge lamps (100-200 lm/W relying on types), and LEDs (125-one hundred fifty lm/W typical in brilliant white depending on type). With each kinds of incandescent bulbs, useful life can be considerably shortened if their filaments experience mechanical shock or EcoLight LED vibration. Using an electronic transformer with a tender begin characteristic can significantly prolong life, as it reduces the characteristically excessive inrush current that occurs initially when the lamp is chilly. Dimming also extends life considerably. MR lamps, like all quartz-halogen lamps, produce some undesirable ultraviolet gentle. Usually, EcoLight LED this have to be filtered out.

Also, the quartz capsules of the lamps might rupture or explode upon failure of the lamps. For these two causes, EcoLight LED some MR lamps embrace a cover glass that serves as an built-in ultraviolet filter and explosion shield. MR16 lamps missing this cowl require using a fixture that incorporates an exterior piece of glass particularly designed to provide each ultraviolet and physical safety. MR lamps can be found in 10-seventy five watt energy rankings (150-800 lumens). MR lamps most often function at 12 volts, although they are additionally accessible in other voltages. These lamps use a bi-pin connector for power: 12-volt MR11 bulbs normally use a GU4 base, and EcoLight smart bulbs 12-volt MR16 bulbs normally use a GU5.3 base. The frequent 12-volt MR16 lamps, subsequently, require a ferromagnetic or digital transformer-typically misnamed as a ballast-to convert the 120- or 230-volt mains voltage to the additional-low voltage required by the lamp. Certain MR lamps can function straight on the mains voltage. These lamps typically use a GU10 turn-and-lock base, in order that they cannot be accidentally interchanged with low-voltage lamps.

GU10 is distinguished from the decrease-voltage MR lamps by the U-shaped ceramic base mount with a ten mm (pin center-to-middle distance) 2-pin bayonet mount. MR16 lamps with an integrated transformer are additionally accessible. These lamps have screw bases to fit normal medium-base Edison sockets. MR lamps are generally accessible in range of shade temperatures, EcoLight LED from about 2700 K to 7000 K, to satisfy various applications. Retrofit lamps that generate light by a unique precept however makes use of the MR form-issue are available. For example, EcoLight LED-based MR16 lamps seem similar to halogen lamps and could be utilized in most fixtures designed for EcoLight MR lamps. The same is true of MR11-suitable LED lamps. Fixtures designed for halogen MR16 or MR11 lamps that use electronic transformers might need to be retrofitted with LED-suitable transformers. There may be a large variety of designs, varying considerably with regard to beam width, gentle color, efficiency and luminous energy.