{Disarmed} RE: VPOP3-SPAM: Dimming halogens bad for lamp life?

["Dean Barrett" <dean@xxxxxxxxx>]

Never had any life issues with dimmed LV halogen.

Have had issues in the past with Mains Halogen generally, but are now
fitting more of them than ever to satisfy Part E of the building regs.

The only real world issue you will have is the difference in colour between
mains and LV Halogen - LV is much whiter and brighter. We block of large
flats where we removed around 80 fittings per flat and fitted fireproof
mains in lieu of LV halogen, and received a few calls that the colour and
brightness was not as good.



Dean.






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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: VPOP3-SPAM: [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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