Just an FYI for anyone interested. I was down at my local Aldi on the weekend and they had the range of LED fittings on special. .99 for a GU10 LED and .99 for an E27 (Edison screw in type), I thought why not, I have nothing to lose. Anyway, I tried the E27 globe first and it dims extremely well on a 5508D1A dimmer. It was mixed with a halogen globe so I took the halogen out to see how it performed on its own and it was exactly the same. Dimmed all the way down to about 10-15% equivalent to the halogen - low enough that I will never need to go that low as its not really usable that low. Next was the GU10 on its own channel - and as expected it was exactly the same as the E27. These are German made globes sold by Aldi, and I am no expert in this area, but the colour is very close to the existing (warm) and performance on the dimmers is exception considering the price. I can't find specs on capacitance though. The manufacturers web site is muller-licht.de. Specs [URL="http://www.mueller-licht.de/zusatzdaten.php?Seite=09a"]here[/URL] - I think it is the 57059 (last column). Anyway, very happy camper at the moment with them being so cheap and working well. Thought others may be interested