Halogens are Incandescent Lamps where the filament envelope is filled with a gas from the Halogen Family ( Chlorine, Bromine, Fluorine, Iodine) thus enabling it to produce a larger amount of light and have a significantly longer life, since the halogen enables the tungsten vapour to recondense back on the filament. As a result, halogens are twice as efficient and have twice the lifetime of Incandescent Bulbs.
ADVANTAGES OF HALOGENS IN GREEN BUILDINGS:
Availability and Cost: They are easily available and do not cost much – Rs50 to Rs 300, depending on the optics, colour and filters.
Variety: In the dichroic version, they are available in different colour temperatures and beam angles which make them an ideal choice for lighting ART and residential Interiors.
Color rendering: They have perfect colour rendering (Ra-100) that causes object colours to appear almost the same as in natural daylight.
Control: They can be dimmed easily, by simply varying the input voltage.
DISADVANTAGES OF HALOGENS IN GREEN BUILDINGS:
Luminous Efficacy: The Luminous Efficacy is quite low- at best around 30 lumens per watt.
Life: The Lifetime is also quite low compared to other lamps – 2000 to 4000 hours.
Because of the poor efficiency they cannot be considered energy efficient light sources. Hence there is the fear that they may become a casualty soon. I hope lighting companies continue their efforts to make these halogens more efficient, so that they can be used for their unique advantages.
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