China
Africa
Explore chapters and articles related to this topic
Lamps, Source Types, & Relative Photometry
Published in Michael Stiller, Quality Lighting for High Performance Buildings, 2020
Halogen lamps are very similar to incandescent lamps in their general workings. A filament is energized with an electrical current that causes it to heat up and glow. The main difference is that the filament of a halogen lamp is made of tungsten (a type of metal), and is enclosed in a smaller envelope filled with an inert gas and a halogen. (Halogens are a group of non-metal elements.) The combination of the halogen and tungsten allows the lamp to be run at a higher temperature without burning up. The result is a slightly cooler color of light and a slightly higher luminous efficacy (up to a maximum of 26 lumens per watt), making these lamps marginally more energy-efficient than traditional incandescent lamps. Like incandescent lamps, halogen lamps are dimmable through the full range of their output.
Electrical Systems
Published in Moncef Krarti, Energy Audit of Building Systems, 2020
Compact halogen lamps are adapted for use as direct replacements of standard incandescent lamps. Halogen lamps are more energy-efficient, produce whiter light, and last longer than incandescent lamps. Indeed, incandescent lamps typically convert only 15 percent of their electrical energy input into visible light because 75 percent is emitted as infrared radiation and 10 percent is used by the filament as it burns off. In halogen lamps, the filament is encased inside a quartz tube that is contained in a glass bulb. A selective coating on the exterior surface of the quartz tube allows visible radiation to pass through but reflects the infrared radiation back to the filament. This recycled infrared radiation permits the filament to maintain its operating temperatures with 30 percent less electrical power input.
Light Sources & Components
Published in Samuel Mills, Fundamentals of ARCHITECTURAL LIGHTING, 2018
Halogen lamps are an incandescent-type lamp that is filled with a small amount of gas, usually iodine or bromine gas to a high internal pressure to maximize lamp efficacy. The gas creates a cycle which redeposits evaporated tungsten back onto the filament, increasing lamp life and the clarity of the glass bulb. Halogen IR lamps have a lamp efficacy of 20+ lumens per watt using a thin film on the inside of the bulb redirecting energy to the filament, increasing light output. Even though ceramic metal halide lamps are more efficient there are instances where the use of CMH lamps is not practical due to cost considerations. Halogen PAR30IR and PAR38IR lamps are suggested also, because they are especially adaptable for typical accent and track lighting applications.
Design reviews on a multipurpose power sockets for different applications
Published in Cogent Engineering, 2018
Chin jie Wong, Umar Nirmal, Sharmeeni Murugan
A halogen lamp, or in other terms as tungsten halogen lamp, is an incandescent lamp. It consists of a tungsten filament sealed into a compact transparent envelope that is filled with a mixture of inert gas and little amount of halogens. The halogen gas inside the bulb will produce halogen cycle chemical reaction by combining with tungsten filament that are heated. A carbon filament lamp was created using chlorine as halogen gas inside the lamp in 1882 and chorine-filled “NoVak” lamps were created in 1892 (Wallace, 2001). The use of iodine as halogen gas inside the lamp was proposed in 1993 and patented by General Electric in 1959 (Kane & Sell, 2001). In conventional tungsten lamps, the filament metal slowly evaporates and condenses on the glass envelope, leaving a black stain. The halogen then removes the deposited tungsten and puts it back on the filament.
Utility and consumer-oriented multi-criteria assessment of residential light bulbs available on the Australian market
Published in Australian Journal of Electrical and Electronics Engineering, 2018
Muhammad Usman, Farhad Shahnia, GM Shafiullah, Ali Arefi
Halogen lamps, similar to standard incandescent lamps, have a tungsten filament covered by halogen gas in the bulb. When an ac voltage is applied to the lamp terminals, the filament begins to radiate light in which its density depends on the level of current passing through it (‘The Halogen Lamp’ 2017).