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USHIO Quartz Infrared Heat (QIH) Lamp Facts

  USHIO Quartz Infrared Heat (QIH) Lamp Facts
USHIO Quartz Infrared Heat (QIH) Lamps

Quartz bulbs are indispensable due to the high temperature tolerance requirement of halogen cycles. There are two kinds of quartz bulbs— transparent and translucent. Translucent quartz bulbs are limited to use in certain heaters. For other types of lamps, frosted transparent quartz bulbs are also popular, as they diffuse the filament image providing a wider distribution of light radiation.

HIGH EFFICIENCY: The lamp envelope is of quartz glass. The compact bulb supplies a high luminous output per watt. The “Halogen Cycle” minimizes evaporation of the tungsten filament.

STABLE COLOR TEMPERATURE: Thanks to the “Halogen Cycle” — a chemical reaction whereby evaporated tungsten particles are returned to the filament —blackening of the bulb wall and thinning of the tungsten filament are kept to a minimum. Light intensity and color temperature remain stable throughout the life of the lamp.

LONG LIFE: The “Halogen Cycle” guarantees extremely long lamp life. Service life is about twice that of an ordinary incandescent lamp.

ECONOMY: Compact and lightweight, halogen lamps have made it possible to design very compact lighting or heating fixtures and equipment, allowing for a reduction in the cost of production facilities. Additionally, the long life of halogen lamps permits a further reduction in maintenance and related expenses.

USHIO Quartz Infrared Heat (QIH) Lamps

HEAT IMPACT RESISTANCE: With their quartz glass envelope, halogen lamps are much more resistant to heat impact than ordinary incandescent lamps. It is very unlikely that a halogen lamp will break should it come into contact with cold water.

WARM UP AND COOL DOWN: When a Quartz Infrared Heater lamp is turned on, it will be able to achieve its maximum radiation (heat energy) in the shortest time when compared with other heaters. The length of time it takes to achieve the maximum radiation output is 40-50 seconds; it also has a rapid cool down when the lamp is switched off.

VOLTAGE VARIATION AND LIFE VARIATION: Voltage Variation and Life Variation is illustrated in Figure 4.2. If 90% of the rated voltage is supplied, the lamp life will be extended by 3.5 times. If 110% of the rated voltage is supplied, the life will be 1/3; however, halogen lamps are made with an amount of halogen gas appropriate to the specific designed filament temperature. If the lamp is operated at a lower voltage, insufficient to raise the temperature of the filament to its optimum value, excess halogen gas will damage the filament. This process works to shorten lamp life. On the other hand, if the lamp is operated at a higher voltage, the bulb wall will darken with excess tungsten vapor.

SEAL TEMPERATURE AND SEAL LIFE: Another cause of shortened lamp life involves damages to the seal. Figure 4.3 shows the relationship between seal temperature and seal life. This graph may vary according to the type of lamp. At high temperature ranges, life values are widely scattered. A molybdenum foil is used at the seal; however, the foil is not completely air tight. There is a very small gap between the quartz seal and the outer lead which enters through the quartz. Through this gap, very small quantities of air can be introduced into the seal area. Molybdenum easily oxidizes when temperatures rise above 350 degrees C. Measurement of the temperature at the seal can be made by using a thermocouple.

FILAMENT (TUNGSTEN) AND MOLYBDENUM FOIL: Quartz Infrared Heater lamps use tungsten filaments because of their high flexibility and low rate of evaporation at high temperatures. Tungsten wire used in the filament is composed of recrystallized particles which are extended along the length of the wire and are interlocked. This specially made tungsten wire makes it possible to produce filaments that are distortion free (nonsagging) and have long life. Known as doped tungsten, this sag resistant filament is in the K2O-SiO2-Al2O3 family.

Molybdenum foil is used as a conductor through the seal area of the Quartz Infrared Heater lamp. The foil, which ensures a hermetic sealing of the lamp, has a configuration as shown in Figure 6.2A. Table 2 lists the characteristics of tungsten and molybdenum.

USHIO Quartz Infrared Heat (QIH) Lamps

FILLING GAS: Together with Nitrogen (N2) and Argon (Ar), a small amount of halogen gas is used to fill the lamp. The most widely used halogen gases are compounds of Bromine (Br) and Chlorine (Cl2). Selection of the halogen gases are based on conditions relative to the lamp application.

BASE AND LEAD WIRE: The base of Quartz Infrared Heater lamp is usually made of steatite or heat resistant metal. The lead wire may be nickel stranded, silicon covered, glass braided or Teflon covered.

The transfer of heat is achieved by three different methods: conduction, convection, and radiation.

CONDUCTION: Occurs when an object is placed in direct contact to a heat source in which the heat is transferred from the source to the object. This can be observed by placing a pan on a hot stove.

CONVECTION: Occurs when a heat source transfers heat to the surrounding atmosphere which in turn, transfers heat to the object it comes in contact with. This is how a hair dryer, conventional oven and home heating works.

RADIATION: Occurs when a heat source emits infrared electromagnetic waves which when striking and absorbed by an object, cause its temperature to rise. This is the way heater lamps and microwave ovens work and also the way the sun heats the earth.

ELECTROMAGNETIC SPECTRUM: Light can be defined as an electromagnetic wave within the range of 100nm-100000nm (1mm). The boundaries for the spezctrum for visible light are 380nm-750nm; IR radiation is divided up into Near-Wave, Intermediate-Wave, and Far-Wave Infrared Radiation. Near-Wave is less than 2000nm, Intermediate-Wave is between 2000 and 4000nm, and Far-Wave IR is above 4000nm.

THE DISTRIBUTION OF QUARTZ INFRARED HEATER (QIH) LAMPS: Several types of halogen lamps with color temperatures ranging from 2000-3400K are available. QIH lamps have a height intensity in Near-Wave radiation, with a color temperature ranging from 2300K to 2700K. IR-Wave radiation produces more effective heating; QIH lamps are specifically designed to use for heating products. Figure 1.2 illustrates the color temperature and spectrum distribution of the QIH lamp. The relative energy increases as the temperature rises with the peak, moving toward the shorter range of the wavelength (visible light range). The wavelength at the point of the peak of the curve can be calculated by dividing 2897 by the color temperature(K).

USHIO Quartz Infrared Heat (QIH) Lamps

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Infared Heat Lamps:

A heat lamp is an incandescent light bulb that is used for the principal purpose of creating heat rather than visible light. By operating the filament at a lower temperature, the spectrum of black body radiation emitted by the lamp is shifted and to produce more infrared light. Many heat lamps include a red filter to minimize the amount of visible light emitted


USHIO Quartz Infrared Heat (QIH) Lamp Facts


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