Am 30.07.2014 15:00, schrieb scott:

>> halogen ones are too
>> actinic.
>
> I don't think halogens offer any efficiency improvements over
> incandescents do they?

They do: Their filaments are hotter than those of classic incandescent 
bulbs, causing their emissive spectrum to be more blueish, so they emit 
less infrared light and more visible light. Some are also coated with a 
material that reflects infrared light.

The gain is rather low however, something like a factor of 1.2 over 
classic incandescent bulbs (*). Just about high enough to still allow 
them to be sold though.

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