RE: Dimming halogens bad for lamp life?

["michael.furlong" <ukha@xxxxxxxxxxxxxxx>]

Phil



The advice I have gleaned is that you should run halogens at full power for
a while every now and then to ensure the deposits are sublimated (correct
word? Not sure:-) ). Whether this makes any real difference or not I don't
know.



In the real world good quality LV halogens have a very long life and the
soft start functionality of dimming systems like CBUS will extend this even
further. Also running bulbs at lower than the maximum rating will extend
life. Someone posted some figures on this recently.



Bottom line is that a soft start dimming system and running at less than
max
rating will extend bulb life be it halogen or mains but you must use good
quality bulbs for the best bulb life.



HTH

Mick







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From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of
Phil Dye
Sent: 12 October 2005 11:29
To: ukha_d@xxxxxxx
Subject: [ukha_d] Dimming halogens bad for lamp life?



I've been looking around at various halogen downlighter fittings,
trying to choose stylish fittings, etc, but of most relevance here,
making sense of mains vs. LV.

There seems to be conflicting opinion over which is "better";
clearly
mains fittings are simpler/cheaper to install (no transformers), but
some suggest that LV bulbs last longer.

Which leads onto... I've read some opinions that dimming any halogen
bulb is bad, because halogen lamps rely on running "hot" for the
tungsten-deposition process to work (see http://tinyurl.com/drdzd).
When dimmed, the lamp runs cooler, preventing this happening, and
leading to premature failure.

Given that we're looking to fit-out half the house with these things
(on a CBUS install), should I be concerned? Are there real-world
problems with lamp life, or is this all theoretical? And mains or LV
(assuming dimmable transformers of course)?

--
phil







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