How is it possible for a halogen lamp to operate with the filament at 2700 degree .....?

Question

How is it possible for a halogen lamp to operate with the filament at 2700 degree Celsius when the tungsten would normally decompose/oxidize at this high temperature?

and:

Is such a high operating temperature desirable?

Answer 1

The molecules do burn off the filament but as they are enclosed in a quartz bulb w. a special gas they buzz around until they settle back down on the filament time and again.
In some applications the heat is the whole point, halogen cookers, usually it's just not relevant.

Answer 2

There is no oxygen inside of a halogen or regular incandescent bulb; therefore, the tungsten cannot oxidize inside the bulb. The filament must be this temperature in order to get visible light. The frequency of EM radiation given off is related to the temperature, higher temperatures allow for higher frequencies to be given off. It turns out that a lot of visible light is given off at 3000 K (2700 degrees C), so we want our filament to be close to that temperature. Higher temperatures could easily melt the tungsten which would defeat the purpose of having a filament. So this temperature is close to optimal for the generation of visible light (what we want from the bulb) and maintain the tungsten filament.

Answer 3

Lack of oxygen. The bulb to a halogen lamp has halogen gas in it. You are correct, 2700 degrees would certainly put a quick end to a tungsten element if it were in an oxygen rich environment. Add a neutral gas and no oxidation occurs to feed the fire and the tungsten no longer burns but glows and this is a truly good thing.