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The original function
of halogen gas is to offer longer life time and
more brightness by creating “halogen cycle” to return
tungsten molecule evaporated from the filament when
turn on the lamp by combining tungsten halide within
the lamps.
What does mean halogen
cycle?
When lamp turned on and its glass wall temperature
reached around 200~250 degree Centigrade, tungsten
molecule which consist of filament start to be
evaporated and combined tungsten-halide by joining
with halogen element in the gas. This tungsten-halide
does not cling to the glass wall and begins to
operate convection and go back to the region of
the filament. At the filament where the temperature
exceeds 2500 degree Centigrade, the tungsten halide
dissociates, the tungsten is deposited on the
filament. This cycle thus keeps the bulb wall
clean by preventing deposition of tungsten and
results in much higher life of lamp and much higher
lumen maintenance.
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