RE: {Disarmed} RE: Dimming halogens bad for lamp life? B uilding Regs

["White, Peter" <peter.white@xxxxxxxxxxxxx>]

I'd be interested to hear about alternatives too.  I've just got some from
Screwfix (cast alu, about =A35 each) and Ikea (pressed steel, about =A33
ea=
ch,
including a bulb!).  Both are finished in a nickel finish, and are
adjustable (as opposed to fixed), and the Screwfix ones are undoubtedly
better quality, and probably worth the extra.  They do however have a
'swivelly collar bit' which I don't want warping.  Like Richard, I've got
dozens of these things to buy, within the next few days.
=20
Pete

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From: rb_ziggy [mailto:richard.boreham@xxxxxxx]=20
Sent: 13 October 2005 23:20
To: ukha_d@xxxxxxx
Subject: Re: {Disarmed} RE: [ukha_d] Dimming halogens bad for lamp life?
Building Regs


Dean

Interested in your conclusions on the best solution.  We built over 4
years ago and at that time installed mains halogen for the reasons of:

- concerns about diming LV units through X10 and possible transformer
interference with X10 signals (only had one chance to get it right and
noone else to blame if we got it wrong).=20

- concerns over heat on the transformers (we have underfloor heating
on the first floor and wool insulation under this / over the
plasterboard in the ceiling (Packed in).

- cost.=20=20

Only issue is I'm not too happy with the fittings.  They are case
aluminium and some have warped a bit (swivelly collar bit around the
bulb, not the main bit that fits flush to the plasterboard).=20
Additionally, they are a b***er to change bulbs as they have a bayonet
twist fit - tricky when there is nothing to get hold of.  Others I've
now seen cave a retaining clip that drops the bulb and bayonet out so
that you can easily change.  Unfortunately, I rejected these at the
time because my bayonet ones had a nice bracket at the back (with the
wiring connector on it) that helped hold the insulation off the back
of the fitting.  (Actually having checked a number, the insulation has
not sagged onto any fitting.)

Suffice to say these are one of the few fittings in the house that I
was dissapointed in and given the choice again would do differently.=20

So if you have any suggestions/recommendations on particular fittings,
I would be interested.  (Unfortunately we have 40+ of these fittings
in the house.)

Regards

Richard=20

--- In ukha_d@xxxxxxx, "Dean Barrett" <dean@r...> wrote:
>
> Sorry perhaps the Mains not LV to suit part E was a little misleading.
>=20=20
> Prior to Part E - downlight installation was dead easy, LV was our
prefered
> choice due to Mains halogen lamp life, and light output. When Part E
was
> introduced our initial route to compliance was standard LV fitting
complete
> with Intumescent hood which complied to Part E and B.
>=20=20
> Coupled with our solution the developers also had to provide their
part of
> Part E compliance and in many instances this was install fibreglass
to the
> ceiling voids. This created a major overheating issue for LV
fittings, 1 was
> that the hood restricted airflow and warped cast Aluminium fittings
which
> means it was getting bl**dy hot in there. The second was that the once
> 'free' in the void airspace were now covered with insulation causing
cutting
> out problems when too hot. All transformers used by ourselves have
internal
> thermal overload trips to ensure the transformer does not melt.
>=20=20
> This caused us a major headache as developers still wanted
downlights, but
> we didnt want to install them, as the failure rate was rising
horrendously.
> Then the clever manufacturers came up* with an all in one fitting that
> complies to Parts B, C, and E. This is available in both LV and
Mains, but
> still required the transformer to be placed in the fibreglass.
Therefore we
> go with Mains now :)
>=20=20
> * There had been a manufacturer provided part B compliant and the
subsequent
> E compliant fitting around for a number of years, but due to their
> 'monopoly' in that area decided to price to the specifiers not the
> installers.=20
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> Long winded way round get to the reason behind out choice.
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> For those who have read this and are now thinking why didnt they put
> transformers out of the way, fit bird cages/flower pots etc. Simple
answer
> really. Many of these fittings were installed in flats or houses with
MF
> ceilings and concrete mid floors so no access from above, and during
the
> period Nov 04, to May '05 we installed in excess of 3000
downlights.....
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> Any other queries ref Noise/Fire etc. ask away - i think i've look
at nearly
> every solution on the market
>=20
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> Dean.
>=20=20
>=20
> Talk for free - skype me  <skype:dean.rolec?call> Call me!
>=20
> Try our amazing lighting demonstration online now, and watch in
realtime via
> our webcam. Click below and follow the CBus links.
>  <http://www.rolec.net/ <http://www.rolec.net/> >
www.rolec.net
> dean@r...
> Tel: 01908-210677
> Fax: 01908-210678
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recipient please
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> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On
Behalf Of
> David Chapman
> Sent: 12 October 2005 15:19
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] Dimming halogens bad for lamp life? Building Regs
>=20
>=20
> > 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.
>=20
> Why do you need to change to mains halogen to meet the regs ? Would
be very=20
> interested to know, selbuilding at the moment and planning to use LV
(for=20
> better light) but there appears to be huge confusion over what you
can and=20
> can't do relating to acoustic and fire ratings of ceiling.
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> David C=20
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