Ads
related to: lamp and light curriculum
Search results
Results From The WOW.Com Content Network
The total lighting load was 52 kilowatts, or 52 watts per square foot. The classroom and industrial rooms could demonstrate suspended incandescent units and fluorescent, mercury vapor, sodium vapor, and sulfur lamps. [12] In 1930, a desk was lighted with 5 to 7 foot candles of light. In 1968, some 50 to 300 foot candles of light were employed.
Some lamps require the ballast to have thermal protection. fluorescent light: A tube coated with phosphor containing low pressure mercury vapor that produces white light. Halogen: Incandescent lamps containing halogen gases such as iodine or bromine, increasing the efficacy of the lamp versus a plain incandescent lamp.
1962 Nick Holonyak Jr. develops the first practical visible-spectrum (red) light-emitting diode. 1963 Kurt Schmidt invents the first high pressure sodium-vapor lamp. [18] 1972 M. George Craford invents the first yellow light-emitting diode. 1972 Herbert Paul Maruska and Jacques Pankove create the first violet light-emitting diode.
The history of electric light is well documented, [11] and with the developments in lighting technology the profession of lighting developed alongside it. The development of high-efficiency, low-cost fluorescent lamps led to a reliance on electric light and a uniform blanket approach to lighting, but the energy crisis of the 1970s required more design consideration and reinvigorated the use of ...
An electric light, lamp, or light bulb is an electrical component that produces light. It is the most common form of artificial lighting . Lamps usually have a base made of ceramic , metal, glass, or plastic which secures the lamp in the socket of a light fixture , which is often called a "lamp" as well.
The three most common types of incandescent lamps are standard incandescent lamps, tungsten halogen lamps, and reflector lamps. Standard incandescent lamps have an efficacy of 10-17 lumens per watts and a lifetime of 750–2500 hours. Tungsten halogen lamps have an efficacy of 12-22 lumens per watts and a lifetime of 2000–4000 hours.
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a filament that is heated until it glows. The filament is enclosed in a glass bulb that is either evacuated or filled with inert gas to protect the filament from oxidation. Electric current is supplied to the filament by terminals or wires ...