G9 LED

[JohnP]

I have had a bit of a saga converting from halogen to LED.

The fitting was served by a dimmer - as this was under loaded I was getting flickering so I bought a V-PRO LED Dimmer Module.

I was annoyed to find that the brightness when set at full on is slightly reduced.

Their technical department pointed out that dimmers work by chopping the waveform - I know - but surely there should be no chopping at the full-on position. Not impressed.

I have reverted to the original MK Dimmer and have put one halogen i the fitting to increase the load.

Seems okay now.

[jon]

Here is a good article:

[Dave Plowman (News]

There is an insertion loss with any dimmer. On tungsten too.

[JohnP]

"Dave Plowman (News)" [e-mail]> wrote in news: [e-mail]:

But why can't it be set up so that when the potentiometer is full on - the dimmer circuitry is bypassed?

[JohnP]

jon [e-mail] wrote in news:s5ons6$pl2$ [e-mail]:

Thanks for the link - a bit beyond my level, but some interesting stuff to browse.

[Jeff Layman]

That is an interesting article, mentioning the Perpetua FlexFan to cool the leds. Although it would be useful for a single high-wattage led unit, I can't see how it could be used for small, domestic luminaires with several separate lights. The other thing I didn't see mentioned was any noise from the fan. Operating at 38Hz it might produce a low frequency, but annoying, hum.

[charles]

You'd need extra circuitry to do this. This would add to size and cost.

[Dave Plowman (News]

All semiconductors insert a slight loss. To totally eliminate this you'd likely need a mechanical switch to bypass the electronics.

So saying, the electronics in an LED should get round any insert loss from the dimmer. Since you're using a V-Pro, are you sure you've programmed it to go up to max?

[JohnP]

"Dave Plowman (News)" [e-mail]> wrote in news: [e-mail]:

Yes - tried the 3 modes and the max / min settings. Their Tech Dept told me to expect some loss. Not impressed.

I have reverted to a conventional MK Dimmer and have put one halogen with 4 LEDs in the fixture. Seems a lot better.

[Dave Plowman (News]

Not sure any other make dimmer will be better in principle? I've got V-Pro dimming the LEDs in the kitchen. I had quite a search to find LEDs to replace the PAR45 halogens, and was on the lookout to find anything to whinge about. Since this was forced on me.