faqtoids.comA multifaceted reflector (typically abbreviated MR) light bulb is a reflector EcoLight housing format for halogen as well as some LED and fluorescent lamps. MR lamps had been originally designed to be used in slide projectors, but see use in residential lighting and retail lighting as effectively. They're suited to functions that require directional lighting corresponding to observe lighting, recessed ceiling lights, desk lamps, pendant fixtures, panorama lighting, retail display lighting, and bicycle headlights. MR lamps are designated by symbols resembling MR16 where the diameter is represented by numerals indicating models of eighths of an inch. Common sizes for common 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 purposes. Many run on low voltage relatively than mains voltage alternating present so require a power provide. 3,314,331 for a miniature reflector lamp in 1967. The innovation was utilizing the lamp rim, fairly than the bottom, as the reference plane for focusing.

This allowed more versatile electrical mounting preparations and more exact focusing. Most MR lamps encompass a halogen capsule (or, bulb) built-in with a pressed glass reflector with a base conforming to bi-pin GU5.3 standard. The reflector controls the direction and unfold of light 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 pass by means of. This sort reduces heating of illuminated objects since much less infrared radiation is current in the sunshine beam. However, dichroic lamps should only be used in appropriate 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 could be adjusted when used with applicable gentle fixtures and dimmers. Nevertheless, the colour temperature modifications significantly when the lamp is dimmed, shifting dramatically to the warmer finish of the spectrum.

Like all halogen lamps, MR lamps produce vital heat and care have to be taken to avoid contact with pores and skin or proximity to flammable materials when the lamp is on or has been on recently. Halogen lamps (18 lm/W typical) are extra vitality efficient than regular incandescent lamps (15 lm/W typical) but nonetheless fall far behind other extra-latest sorts akin to fluorescent lamps (80-a hundred lm/W), fuel discharge lamps (100-200 lm/W depending on types), and LEDs (125-a hundred and EcoLight smart bulbs fifty lm/W typical in vibrant white relying on type). With both varieties of incandescent bulbs, helpful life can be considerably shortened if their filaments experience mechanical shock or vibration. Using an electronic transformer with a tender begin feature can significantly extend life, as it reduces the characteristically high 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, this must be filtered out.

Also, the quartz capsules of the lamps might rupture or explode upon failure of the lamps. For these two causes, some MR lamps include a cowl glass that serves as an integrated 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 offer both ultraviolet and bodily safety. MR lamps are available in 10-75 watt energy scores (150-800 lumens). MR lamps most often operate at 12 volts, although they are also available in different voltages. These lamps use a bi-pin connector for energy: 12-volt MR11 bulbs often use a GU4 base, and 12-volt MR16 EcoLight smart bulbs normally use a GU5.Three base. The common 12-volt MR16 lamps, due to this fact, require a ferromagnetic or digital transformer-typically 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 immediately on the mains voltage. These lamps typically use a GU10 flip-and-lock base, so they can't be unintentionally 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 center-to-middle distance) 2-pin bayonet mount. MR16 lamps with an built-in transformer are additionally accessible. These lamps have screw bases to suit customary medium-base Edison sockets. MR lamps are commonly accessible in vary of colour temperatures, from about 2700 Okay to 7000 Ok, to fulfill numerous functions. Retrofit lamps that generate gentle by a distinct precept however makes use of the MR type-factor are available. For example, LED-primarily based MR16 lamps appear much like halogen lamps and might be used 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 might must be retrofitted with LED-appropriate transformers. There is a large variety of designs, various considerably with regard to beam width, light color, efficiency and luminous power.

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Pub: 08 Aug 2025 04:17 UTC

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