Rafal wrote:

Just had a look at some 240V halogen downlighters from B&Q.
I have noticed that the bulb or rather the reflector part of it has
diffrent color to LV 12V ones /240V clear , 12V slight colour shading/

You may have been comparing a bulb with an standard aluminium reflector
against one with a dichroic reflector. On the latter type, the reflector
reflective to most of the visible spectrum, but translucent for some
parts of it and also for most of the infra-red wavelengths. The
advantage is they do not project as much heat forward as the standard
aluminium reflector ones. The also tend to look slightly nicer for
display lighting as the slight colour staining you get from different
angles can look quite attractive.

(you should not use dichroic bulbs unless the fitting is designed for
them, because the fitting will get hotter)

Is there any noticable diffrence between them in terms of the light output
per Watt.
and the light quality itself?

The LV ones will give more light per watt. They also have a thicker
filament and hence are more tolerant of vibration and shock.


--
Cheers,

John.

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