Halogen Lamps Introduction

Halogen lamps offer high brightness, high color temperature and minimum lumen depreciation during lamp life. We has Quartz halogen lamps at 10 - 400 watts operating on voltages ranging from 6 to 120 volts AC or DC. Our typical halogen lamp construction includes G4, G6.35, MR11 and MR16. Halogen lamps are ideal as light sources for spectrophotometry instruments, fiberoptics and optical scanners, as they provide broad band spectral radiation ranging from the ultraviolet, through the visible and into the infrared. The Holders represent precision construction and are intended for high temperature halogen lamp use..

Halogen lamps have become very popular because they produce a large amount of light and the purchase cost is very reasonable. The halogen lamps, also sometimes called a torch or torchiere lamp, produce intense light by using high-temperature halogen bulbs. These bulbs can reach temperatures of over 1000. Halogen lamps are also a type of incandescent lamp. The halogens in the bulbs prevent evaporated tungsten from depositing on the glass bulb. They are more expensive to buy but last up to two thousand hours. They can be either 240V bulbs, which are usually tubular and often used in uplighters and outdoor floodlights, or low voltage bulbs typically used in downlighting. All halogen lamps require special light fittings.

Low voltage halogen lamps are not low energy lamps. Low voltage halogen lamps are slightly more efficient than normal bulbs of the same wattage, but they use a transformer that can consume from 10 to 30 percent of the bulb energy, reducing the efficiency gain. More efficient electronic transformers are available which reduce transformer losses. Low voltage halogen lamps are most suitable for highlighting features such as paintings or for task lighting directly over a cooking area or study desk. If used, fit lower wattage and more efficient bulbs. Efficient 35W lamps are available that produce as much light as a standard 50W lamp.

Halogen lamps provide simple beam lighting and are small, lightweight and inexpensive. These lamps are commonly used as projection-type backlights in compact projectors and other equipment. Compact LCD projectors and projectors used to display information on automobile windshields use reflector-type halogen lamps ranging in size from 20 W to 300 W. Dual-end 300 W halogen lamps are often used in OHPs.

Application of Halogen Lamps

Halogen Lamps are similar in construction to conventional gas filled tungsten filament lamps except for a small trace of halogen (normally bromine) in the fill gas. The halogen gas reacts with the tungsten that has evaporated, migrated outward, and been deposited on the lamp wall. As the quartz envelope wall reaches a temperature of approximately 250?, the halogen reacts with the tungsten to form tungsten halide, which is freed from the wall of the lamp and migrates back to the filament. The halide compound reacts at the filament where temperatures approximating 2,500? cause the tungsten and halogen to dissociate. The tungsten deposits onto the colder portions of the filament, and the halogen is freed to continue the cycle.

The filament of a Halogen Lamp has two purposes. One is to generate light, and the second is to generate the heat necessary to obtain a wall temperature exceeding 250?. These lamps have been designed to maintain this required wall temperature when operated at design voltage. A reduction of voltage exceeding 10% from the design voltage will probably result in the wall temperature falling below the required 250?. Tests reveal that in most cases this reduced operating condition is not detrimental to the operation of the lamp. By the time the wall temperature drops to a point where the halogen cycle ceases to function, the filament temperature has diminished to a point where the tungsten evaporation is negligible. If wall blackening is noticed, the operating voltage range at which this occurs should be avoided. Burning the lamp at design voltage for a short period of time can usually clean up lamp blackening due to temporary operation in such a voltage range. However, on rare occasions halogen lamps de-rated by more than 10% could experience an adverse reaction of the corrosive halogen attacking the tungsten filament causing premature lamp failure.

Thanks to their high luminance the small halogen lamps get any object out of the shadow selectively. Their warm white light is radiated at an angle of three to 60 degrees. The brightness can be softened by a dimmer. Watch out: All halogen lamps in the household become very hot. Therefore the distance between the lamp and the illuminated object should be at least half a meter. Halogen lamps are more expensive than conventional bulbs, but they are save energy. At the same wattage their luminous efficiency is the same as that of bulbs, but their service life is at least twice as long as that of bulbs.

Various kinds of halogen lamps types

include:
halogen floor lamps , halogen desk lamps , halogen wall lamps ,
Low Voltage Halogen Lamp , halogen table lamps , etc.

Some picture of halogen lamps: