On 21/04/2021 09:31, jon wrote:
On Tue, 20 Apr 2021 19:43:39 +0000, JohnP wrote:

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.

Here is a good article: https://www.ledsmagazine.com/leds-ssl-design/
article/14168524/linear-led-driver-approach-can-be-the-simplest-ssl-option-
magazine

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.

--

Jeff