Cheers for your quick reply! I'm really glad I ran it by you, I was being silly and expected each to get about 450mA, that's not how series works! The 30W is a much better fit.
Hi Supra. Thank you very much for all your LED tech info, it's been very helpful. I'm interested in your opinion on these bad boys: http://shop.stevesleds.com/Philips-Luxeon-M-4000K-12-Watt-LEDs-LuxM4K.htm
The numbers look very good...
I'd use 3 in series with the 50W Fasttech driver.