A multifaceted reflector (usually abbreviated MR) light bulb is a reflector housing format for EcoLight bulbs halogen as well as some LED and fluorescent lamps. MR lamps have been initially designed to be used in slide projectors, but see use in residential lighting and retail lighting as properly. They are suited to purposes that require directional lighting equivalent to monitor lighting, recessed ceiling lights, desk lamps, EcoLight reviews pendant fixtures, panorama lighting, retail show lighting, and bicycle headlights. MR lamps are designated by symbols such as MR16 the place the diameter is represented by numerals indicating models of eighths of an inch. Common sizes for basic lighting are MR11 (11⁄8 inches, 35 mm) and MR16 (16⁄8 inches, 51 mm), with MR8 (8⁄8 inch, 25 mm) and MR20 (20⁄8 inches, 64 mm) used in specialty applications. Many run on low voltage somewhat than mains voltage alternating present so require a energy provide. 3,314,331 for a miniature reflector lamp in 1967. The innovation was using the lamp rim, slightly than the bottom, as the reference airplane for focusing.

This allowed more flexible electrical mounting preparations and more precise focusing. Most MR lamps consist of a halogen capsule (or, bulb) built-in with a pressed glass reflector with a base conforming to bi-pin GU5.Three commonplace. The reflector controls the direction and spread of gentle solid from the lamp. Some lamps use an aluminum coating as a reflector. Others use selective dichroic coating that reflects visible mild and permits infrared radiation to cross by. This kind reduces heating of illuminated objects since much less infrared radiation is present in the sunshine beam. However, dichroic lamps should only be utilized in suitable fixtures that can dissipate the heat. Dichroic lamps must not be fitted to recessed or enclosed luminaires with the IEC 60598 No Cool Beam image. The brightness of MR lamps can be adjusted when used with acceptable light fixtures and dimmers. However, the coloration temperature adjustments considerably when the lamp is dimmed, shifting dramatically to the warmer end of the spectrum.

Like all halogen lamps, MR lamps produce significant heat and care should be taken to avoid contact with pores and skin or proximity to flammable supplies when the lamp is on or has been on just lately. Halogen lamps (18 lm/W typical) are extra energy environment friendly than common incandescent lamps (15 lm/W typical) however still fall far behind other extra-recent types comparable to fluorescent lamps (80-100 lm/W), fuel discharge lamps (100-200 lm/W relying on types), and LEDs (125-one hundred fifty lm/W typical in vibrant white relying on fashion). With each kinds of incandescent bulbs, helpful life will be considerably shortened if their filaments expertise mechanical shock or vibration. Utilizing an electronic transformer with a gentle begin feature can significantly lengthen life, as it reduces the characteristically excessive inrush current that happens initially when the lamp is chilly. Dimming additionally extends life considerably. MR lamps, like all quartz-halogen lamps, produce some undesirable ultraviolet mild. Normally, this must be filtered out.

Additionally, the quartz capsules of the lamps may rupture or explode upon failure of the lamps. For EcoLight these two causes, some MR lamps embody a cowl glass that serves as an built-in ultraviolet filter and explosion shield. MR16 lamps missing this cowl require the usage of a fixture that incorporates an exterior piece of glass specifically designed to supply each ultraviolet and bodily safety. MR lamps are available in 10-seventy five watt power rankings (150-800 lumens). MR lamps most often function at 12 volts, though they're additionally available in other voltages. These lamps use a bi-pin connector for power: 12-volt MR11 bulbs usually use a GU4 base, and 12-volt MR16 EcoLight bulbs normally use a GU5.3 base. The common 12-volt MR16 lamps, therefore, EcoLight require a ferromagnetic or electronic transformer-sometimes misnamed as a ballast-to convert the 120- or 230-volt mains voltage to the extra-low voltage required by the lamp. Sure MR lamps can operate directly on the mains voltage. These lamps sometimes use a GU10 turn-and-lock base, so they can't be accidentally interchanged with low-voltage lamps.

GU10 is distinguished from the lower-voltage MR lamps by the U-shaped ceramic base mount with a 10 mm (pin middle-to-middle distance) 2-pin bayonet mount. MR16 lamps with an integrated transformer are also accessible. These lamps have screw bases to suit commonplace medium-base Edison sockets. MR lamps are generally available in vary of color temperatures, from about 2700 K to 7000 Ok, to satisfy various applications. Retrofit lamps that generate gentle by a unique principle but uses the MR form-factor are available. For example, LED-primarily based MR16 lamps seem much like halogen lamps and could be utilized in most fixtures designed for MR lamps. The same is true of MR11-suitable LED lamps. Fixtures designed for halogen MR16 or MR11 lamps that use electronic transformers could must be retrofitted with LED-suitable transformers. There is a large number of designs, varying significantly with regard to beam width, gentle colour, efficiency and luminous energy.