[Greenbuilding] compact fluorescent bulbs/Halogen

[Lance Collins]

David Bergman said,



>My understanding is that halogens are only somewhat more efficient
>than incandescent (with the IR versions being better) -- maxing out
>at around 20 lumens per watt and many of the cheaper ones only in the
>low teens -- and they are still fundamentally incandescent (i.e. work
>by heating a filament until it glows) and inefficient. CFL's get
>around 50 - 60 lumens per watt.

There's an argument that halogens are the least efficient lighting 
when you consider how they are typically used.   Low voltage halogens 
have a transformer which uses power in addition to the halogen 
itself.   My impression is that when mounted in ceilings too many are 
used and that often the heat from the fittings means that avoiding an 
insulation fire risk  compromises the effectiveness of the insulation.




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