Solar and alternative energy

What is the function of the phosphors in a compact fluorescent lamp?

(i)What is the function of the phosphors in a compact fluorescent lamp?
(ii)Why is quartz used in a halogen lamp?

A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapor. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light.The phosphor is the white internal coating on the glass tube.

A halogen lamp is an incandescent lamp in which a tungsten filament is sealed into a compact transparent envelope filled with an inert gas and a small amount of halogen such as iodine or bromine. The combination of the halogen gas and the tungsten filament produces a chemical reaction known as a halogen cycle (see below) that increases the lifetime of the bulb and prevents its darkening by redepositing tungsten from the inside of the bulb back onto the filament.

At moderate temperatures the halogen reacts with the evaporating tungsten, the halide formed being moved around in the inert gas filling. At some time it will reach higher temperature regions, where it dissociates, releasing tungsten and freeing the halogen to repeat the process. In order for the reaction to operate, the overall bulb temperature must be higher than in conventional incandescent lamps. The bulb must be made of fused silica (quartz) or a high melting point glass (such as aluminosilicate glass). Quartz being very strong, the gas pressure can be higher, which reduces the rate of evaporation of the filament, permitting it to run a higher temperature (and so efficacy) for the same average life.

Health Effects - Compact Fluorescent Bulbs

Earthmate EP2352AK 23-Watt Super Mini-Spiral CFL 2700K Bulb, 6 Pack $39.77 ...

Earthmate EP2357AE 23-Watt Spiral CFL Full Spectrum Bulb, 6 Pack $55.17 ...

Earthmate EP3052AE 30-Watt Spiral CFL 2700K Bulb, 6 Pack $47.74 ...

20W 120V PAR-38 850 Lumen Warm Compact Fluorescent Bulb, Pack of 6 $232.02 20W 120V PAR-38 850 Lumen Warm Compact Fluorescent Bulb, Pack of 6...

Green Pirate: Season 1 $14.99 Captain Greene and Dr. Alder explore Green Energy and Conservation solutions in the full-quality version of the Green Pirate series season 1 from EastCoastGames.com . This includes episodes I - X, a Making of Featurette, Outtakes, and Deleted Scenes.Episode List: I Green Electricity II Flex Fuel III Electric Cars IV Solar Power V Solid State Lighting (LEDs) VI Compact Fluorescent VII Bio-H...

compact discs, mozzarella cheese, pantyhose, and fluorescent tubes ...

Panasonic PANASONIC FDS18E35/4 REPLACEMENT LAMP $4.86 THIS PANASONIC FDS18E35/4 REPLACEMENT LAMP IS A T4 TRI-PHOSPHOR 4-PIN PLUG-IN COMPACT FLUORESCENT LAMP (CFL) IN A QUAD TUBE DESIGN FEATURES DURABLE, HIGH-QUALITY COMPONENTS AND ADVANCED TECHNOLOGY FOR OUTSTANDING PERFORMANCE. AS A RESULT, THIS LIGHT BULB OFFERS A NUMBER OF SIGNIFICANT ADVANTAGES OVER INCANDESCENT BULBS: IT CONSUMES UP TO 70% LESS ENERGY, GENERATES LESS HEAT AND FEATURES A 10,000-H...

Feit Elictric FC8T9/CW Compact Fluorescent Circular Light Bulb $4.49 Feit Elictric FC8T9/CW Compact Fluorescent Circular Light BulbEvery light bulb that we manufacture is produced to the highest specifications in the industry. Fully equipped testing laboratories at the factory and distribution centers assure consistent quality. Every lamp is tested after production and before packaging.Feit Elictric FC8T9/CW Compact Fluorescent Circular Light Bulb Features:; Energy...

Verilux 36352 - CFML36VLX Compact Fluorescent Daylight Full Spectrum Light Bulb $20.74 36 watt T5 4-Pin Base Natural Spectrum® Deluxe Double Tube Compact Fluorescent Verilux Light Bulb (For VT03 / VT05)...

Honeywell Econoswitch RPLS740B 7-Day Solar Time Table Programmable Switch for Lights and Motors $35.89 The Honeywell RPLS740B 7-Day Solar Time Table Programmable Switch for Lights and Motors helps you save money by ensuring that your lights come on only when you need them. This unit works with incandescent, halogen, and fluorescent lighting, making it ideal for indoor or outdoor use. It also works with ceiling fans, bathroom fans, pond pumps, and pool pumps. Featuring three operating modes and sev...