Andrew Gabriel wrote:
[snip further long, useful information]

A bit more Googling and remembering has brought up a series of devices
made by Maxim specifically for LEDs. Read all about it:-
http://www.maxim-ic.com/solutions/hb...vers/index.mvp

The devices themselves are pretty cheap (almost all less than $2) so
anyone into DIY can make themselves nice cheap LED power supplies.
There's a whole range, both linear (ultra simple) and switch mode
(more efficient of course) with and without built in power mosfets.

A while ago I got free samples of battery charging devices from Maxim,
if you pitch your request right I bet you could get a few free sample LED
power supply devices.

--
Chris Green