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Light fixtures may also have other features, such as reflectors for directing the light, an aperture (with or without a lens), an outer shell or housing for lamp alignment and protection, an electrical ballast or power supply, and a shade to diffuse the light or direct it towards a workspace (e.g., a desk lamp).
As radiators work at a relatively low temperature, the Stefan–Boltzmann law [note 1] means that they are weak radiators of heat. Most heat from a domestic radiator is as convection currents of heated air. Where a reflector foil also has some insulating ability against conduction (i.e. losses through the wall), it may have some useful effect ...
The reflector had found favor where the choices of artificial light provided poor illumination compared to modern electric lighting. Light shelves are an effective way to enhance the lighting from windows on the equator-facing side of a structure, this effect being obtained by placing a white or reflective metal light shelf outside the window. [19]
The most common type of floodlight was the metal-halide lamp, which emits a bright white light (typically 75–100 lumens/Watt). Sodium-vapor lamps are also commonly used for sporting events, as they have a very high lumen to watt ratio (typically 80–140 lumens/Watt), making them a cost-effective choice when certain lux levels must be provided. [4]
A decorative light fixture that is mounted to a wall [45] Street light A type of outdoor pole-mounted light used to light streets and roadways; similar to pole-mounted flood lights but with a type II lens (side to side light distribution pattern) instead of type III [46] Strip lights or industrial lighting Often long lines of fluorescent lamps ...
Left to right: MR16 with GU10 base, MR16 with GU5.3 base, MR11 with GU4 or GZ4 base Line drawing of an LED MR16 lamp, with a heatsink rather than a reflector. A multifaceted reflector (often abbreviated MR) light bulb is a reflector housing format for halogen as well as some LED and fluorescent lamps.