Qingqing: Electric light

I had find many products about electronic lamp ballast from some websites such as

	Full Color Led Video Display For.. The versatile modular Led video panels, which can be assembled into large scale video screens for..
	pendent lighting fixture Place of Origin: China Guangdong Material: Aluminum Brand Name: Land Lighting Light..

And you can see more from microsoft direct push pendant light fixtures electronic ballast fixtures fl lamp ballast refrigerated store fixtures glass lamp shade fluorescent light fixture T8 Electronic Ballast pole light fixtures
Most of the industrialized world is lit by electric lights, which are used both at night and to provide additional light during the daytime. These lights are normally powered by the electric grid, but some run on local generators, and emergency generators serve as backups in hospitals and other locations where a loss of power could be catastrophic. Battery-powered lights, usually called "flashlights" or "torches", are used for portability and as backups when the main lights fail.
Contents
1 Types
1.1 Incandescent light bulb
1.1.1 Halogen lamp
1.2 Fluorescent lamp
1.3 LED lamp
1.4 Carbon arc lamp
1.5 Discharge lamp
2 Lamp Life Expectancy
3 Vendors
4 Public lighting
5 See also
//
Types
Types of electric lighting include:
incandescent light bulbs
arc lamps
gas discharge lamps, e.g., fluorescent lights and Compact fluorescent lamps, neon lamps, flood lamps, modern photographic flashes
lasers
light-emitting diodes, including OLEDs
sulfur lamps
Different types of lights have vastly differing efficiencies and color of light. [1]
Name
optical spectrum
nominal efficiency(lm/W)
Lifetime (MTBF)(hours)
Colour temperature(kelvins)
Colour
Colorrenderingindex
Incandescent light bulb
Continuous
12-17
1000-2500
2700
Warm white (yellowish)
100
Halogen lamp
Continuous
16-23
3000-6000
3200
Warm white (yellowish)
100
Fluorescent lamp
Mercury line + Phosphor
52-100
8000-20000
2700-5000*
White (with a tinge of green)
15-85
Metal halide lamp
quasi-Continuous
50-115
6000-20000
3000-4500
Cold White
65-93
Sulfur lamp
Continuous
80-110
15000-20000
6000
Pale green
79
High pressure sodium
broadband
55-140
10000-40000
1800-2200*
Pinkish orange
0-70
Low pressure sodium
narrow line
100-200
18000-20000
1800*
Yellow, virtually no color rendering
0
*Color temperature is defined as the temperature of a black body emitting a similar spectrum; these spectra are quite different from those of black bodies.
The most efficient source of electric light is the low-pressure sodium lamp. It produces an almost monochromatic orange light, which severely distorts color perception. For this reason, it is generally reserved for outdoor public lighting usages. Low-pressure sodium lights are favoured for public lighting by astronomers, since the light pollution that they generate can be easily filtered, contrary to broadband or continuous spectra.
Incandescent light bulb
Main article: Incandescent light bulb
Incandescent light bulb as we know it today, with a coiled filament of tungsten, was commercialised in the 1920s developed from the carbon filament lamp introduced in about 1880. As well as bulbs for normal illumination, there is a very wide range, including low voltage, low-power types often used as components in equipment, but now largely displaced by LEDs
There is currently interest in banning some types of filament lamp in some countries, such as Australia planning to ban standard incandescent light bulbs by 2010, because they are inefficient at converting electricity to light.Sri Lanka has already banned importing filament bulbs because of high use of electricity and less light. Less than 3% of the input energy is converted into usable light. Nearly all of the input energy ends up as heat that, in warm climates, must then be removed from the building by ventilation or air conditioning, often resulting in more energy consumption. In colder climates where heating and lighting is required during the cold and dark winter months, the heat byproduct has at least some value.
Halogen lamp
Main article: Halogen lamp
Halogen lamps are usually much smaller than standard incandescents, because for successful operation a bulb temperature over 200 is generally necessary. For this reason, most have a bulb of fused silica (quartz), but sometimes aluminosilicate glass. This is often sealed inside an additional layer of glass. The outer glass is a safety precaution, reducing UV emission and because halogen bulbs can occasionally explode during operation. One reason is if the quartz bulb has oily residue from fingerprints. The risk of burns or fire is also greater with bare bulbs, leading to their prohibition in some places unless enclosed by the luminaire. Those designed for 12V or 24V operation have compact filaments, useful for good optical control, also they have higher efficacies (lumens per watt) and better lives than non halogen types. The light output remains almost constant throughout life.
Fluorescent...(and so on)