Re: Re: High output downlights

["Simon Coates" <ecolume@xxxxxxxxxxxxxxx>]

I've used discharge dimming controllers in the past.  They've been
available
for about 10 years now.  The ones I used to sell would dim high pressure
sodium, steplessly, down to about 5%.  Metal Halide could be dimmed to
about
15% before any noticeable colour shift.  It utilised the standard control
gear, only the PFC capacitor had to be removed - the controller didn't like
capacitive loads.
I had a demo case that we made - but it was lost in a fire :o(

Simon


----- Original Message -----
From: Neil Ball <neilball@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: 02 March 2004 18:58
Subject: RE: [ukha_d] Re: High output downlights


> Well it's good to know that the opportunity exists - I've only ever
seen
> switched control gear/starters for metal halide sources. In fact the
last
> few fibre optic projectors I'd seen that used dimmable metal halide
lamps
> used a graduated dimming wheel to progressively block out more light
rather
> than dimming the lamp directly!
>
> Neil B.
>
> -----Original Message-----
> From: David Buckley [mailto:db@xxxxxxx]
> Sent: Tuesday, March 02, 2004 18:44
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] Re: High output downlights
>
>
> --- In ukha_d@xxxxxxx, "Neil Ball" <neilball@b...>
wrote:
> > Not dimmable I'm afraid - metal halide is a form of
> > discharge lighting.
>
> Common misconception - discharge lighting is dimmable, but it aint
> easy, so the advice is exactly as you state, be sitting down :-)
>
> I've only ever seen it used in Film/TV/Photo lighting applications.
>
>
>
>
>
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