That could be true, but at half power it just glows bright orange,
probably tungsten does not get to evaporate yet.

Not many options are available here locally. I know about proper
halogen infrared heaters, but they are basically 10 times more
expensive.

>
> I believe that they need to get up to a proper working temperature for th=
e tungsten-halogen cycle to work properly. If they are not hot enough the h=
alogen doesn't stop the tungsten evaporating off the filament, or something=
 like that. I do remember it involves an evaporation redeposition of the tu=
ngsten.
>
>
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