Halogen Tungsten
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 JTL Tungsten Halogen 1000w Superlight Studio Light 1k  US $104.99
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 Sylvania EGT Box of 8 1000 W Tungsten Halogen Bulbs US $95.00
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 PBL Tungsten Halogen Continuous Studio Light 1000w 1k US $94.00
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 Sylvania FBT 350W 30V tungsten halogen lamp US $36.38
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 Tungsten Halogen Lamp JCR 12V 35W US $35.00
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 Sylvania Tungsten Halogen Lamp 500 Watt 120 Volts US $30.00
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 NEW Sylvania FRK CP89 Tungsten Halogen Projector Lamp US $29.99
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 5 x 800W 110V 3200K Halogen Tungsten Red Head Bulb Light US $29.99
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 5x 800w 110v Halogen Tungsten Red Head Bulb Light US $29.99
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 5 x 800W 220V 3200K Halogen Tungsten Red Head Bulb Light US $25.99
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 5x 800w 220v Halogen Tungsten Red Head Bulb Light US $25.99
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 5 x 800W 220V 3200K Halogen Tungsten Red Head Bulb Light NEW US $25.97
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 SYLVANIA TUNGSTEN HALOGEN LAMP 1500W 120V MOGUL SCREW US $17.99
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 Sylvania Tungsten Halogen Lamp EHF 750W 120V New In Box US $17.00
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 2 Sylvania Tungsten Halogen Super Q Light Bulbs US $16.99
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 Halogen Tungsten Bulb f Red Head Continuous Light 2000W US $16.99
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 SET of 2 250 Watt Tungsten Halogen Modeling Lamp US $15.00
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 Halogen Tungsten Bulb Fresnel Continuous Light 1000w US $14.99
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 FREE SHIPPING 2pcs 50 W Tungsten Halogen Modeling Lamp US $14.99
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 EHD Sylvania Tungsten Halogen Lamp Bulb 500W 120V New NOS US $14.99
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 250 Watt Tungsten Halogen Modeling Lamp Replacement NEW US $14.99
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 Sylvania Tungsten Halogen Lamp Bulb – 100 W – 130 V – New US $10.80
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 2 PCS ATLAS LOW VOLTAGE TUNGSTEN HALOGEN LAMP 12V 100W US $10.50
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 SET of 2 50 Watt Tungsten Halogen Modeling Lamp US $10.00
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 Halogen Tungsten Bulb for Continuous Red Light 650W US $9.99
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 Halogen Tungsten Bulb for Fresnel Continuous Light 650w US $9.99
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 Dedolight 12V 100W Quartz Halogen Lamp Tungsten Heads DL100 US $9.99
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 800w Halogen Tungsten Continuous Light Red Head Bulb US $6.99
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Deposition of tungsten back on the filament in a halogen lamp?
I've searched online and not one website has really answered this: why does the halogen + tungsten compound (WI4) deposit back on the filament? Why not on the glass?
WI4 is a gas
The tungsten filament is actually hotter than the glass. It's 'white hot'.
According to How Stuff Works, the tungsten filament on a halogen lamp is usually encased in a quartz envelope or hard glass, not regular glass. The halogen allows the bulb to burn hotter than ordinary incandescent light bulbs; halogen lamps operate at temperatures that would melt ordinary glass.
What I infer from the second source (which references a Wikipedia article), the quartz or the glass would be so hot that any tungsten that deposits on the glass would evaporate, so the only place the tungsten can deposit is on the filament.
Hope I helped!
==Edit==
Quote from the second source:
"According to Wikipedia: http://en.wikipedia.org/wiki/Halogen_lamp…
Because the lamp must be very hot to prevent crystalistaion of WO2I2 or WO2Br2 at the glass surface, the halogen lamp's envelope must be made of hard glass or fused quartz, instead of ordinary soft glass which would soften and flow too much at these temperatures..."
And according to the source, the gas produced is WO2I2, not WI4, .
==Edit 2 (Wow!)==
A little bit before the quote in Edit 1:
"A tungsten-halogen lamp creates an equilibrium reaction in which the tungsten that evaporates when giving off light is preferentially re-deposited at the hot-spots, preventing the early failure of the lamp. This chemical transport reaction is based on WO2I2 or WO2Br2 formation at elevated temperatures and its decomposition at high temperatures at the tungsten filament."
What I infer is that only the filament can decompose the gas, liberating the halogen and leaving the tungsten metal behind, on the filament. Which makes sense with what you were saying: the glass/quartz is hot enough to prevent the deposition of WO2I2 on the surface but not enough to decompose the compound.
Tungsten halogen lamps
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