RE: Dichroic to Dimmable LED - Umm.....

["Phil Harris" <phil@xxxxxxxxxxx>]

...is the weather like outside?

...is the triple point of bifurricated argon?

...is the appropriate etiquette for kissing on a first date?

...is the question?

:-D

Phil

> -----Original Message-----
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf
> Of Darren Karp
> Sent: 14 January 2010 21:13
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Dichroic to Dimmable LED - Umm.....
>
> What?
>
>
>
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf
> Of
> Richard (lists account)
> Sent: 14 January 2010 10:34
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Dichroic to Dimmable LED - Umm.....
>
>
>
>
>
> After seeing inside several of the available GU10 replacements when
> they
> have died, there is no way I would be considering them dimming or not.
>
> Line voltage smoothed into 400v electrolytic caps, small smd resistors
> across the resulting 375v nominal voltage, nothing preventing the
board
> moving too close to the alu heatsink which is not grounded since it
has
> none
> in the terminal - potential shock hazard there IMO.
>
> And thats before you even try to start dimming a constant current
> supply
> that needs smoothing caps to eliminate flicker with a phase angle
> dimmer.
>
> It's just not there yet. Even the G5.3 based 12v ones are a pain to
try
> to
> control, and IMO as long as they try to be drop in replacements for
> incandescent lamps then they will suck for controlling them.
>
> Really there needs to be a current controlled power supply for them,
> and
> someone could make one that has a phase angle dimming input like there
> are
> dimmable CFL lamps, but that would need a different base to prevent
> mixups
> with low voltage AC or DC fittings.
>
> Its great to want to save money and get a decent white light with LED,
> but
> controlling it is something I have given up on for now. Even
electronic
> transformers make problems with LEDs because of the high frequency
that
> they
> output messing with the rectifiers in some LED replacements.
>
> > -----Original Message-----
> > From: ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
> [mailto:ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
] On
> Behalf
> > Of Kenneth Watt
> > Sent: Wednesday, 13 January 2010 11:33 p.m.
> > To: ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
> > Subject: Re: [ukha_d] Dichroic to Dimmable LED - Umm.....
> >
> > Hi Gareth,
> >
> > I've been going down the same route and, although I'm still
waiting
> on
> > a couple to test, thus far the "dimmable drop-in
replacement" doesn't
> > work with the X10 modules.
> >
> > They will dim, they will ramp up and down within a certain range
but
> > they cut out at the upper and lower ends of the dimming range.
Apart
> > from which they produce horrendous line noise.
> >
> > So far I've tried both dimmable GU10 (2 versions, 1 the Cree LED)
and
> a
> > liquid cooled LED SES fitting. I've also fitted a load of GU4 LED
> > replacements and, despite being advertised as a
"drop-in" replacement
> > for the standard bulbs, they do need pukka LED drivers fitted and
not
> > the halogen transformers or the LED bulbs have a nasty habit of
> > overheating and blowing themselves to bits, literally.
> >
> > They do not produce the same sort of light (different
temperature) or
> > as much light IMO as a standard bulb will.
> >
> > My advice is that they are fine as lights that you want to run
for
> > extended periods to see where you're going or for security
purposes
> > but, to have them as replacements for normal lamps totally... I
> > wouldn't advise it based on the current crop.
>
>
>
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> Version: 9.0.725 / Virus Database: 270.14.140/2621 - Release Date:
> 01/14/10
> 12:39:00
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>
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>
>
>
> ------------------------------------
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