Having fitted my awning LED strip the full length of my awning (6m) it was a bit on the bright side so bought one of these from eBay for the princely sum of £2.95 inc postage and have to say it's great. It was simple to wire up and there are 3 preset brightness levels 25% 50% or 100% at a touch of a button or you can alter it anywhere in between but also has different modes which you can choose like flashing, soft twinkly etc (not that I'll be using any of them, could look like a bl..dy christmas tree!!!)
http://r.ebay.com/hmDqBO
David
http://r.ebay.com/hmDqBO
David