LED Voltage & Current Control Module - Tough To Beat
http://www.buyincoins.com/item/48725.html#.VTssuPA5ngY From China. No shipping / No tax $5.59 U.S.D.
Forum Discussion
I have two of them I have played with, very stable output. I ordered a bunch of G4 LED arrays 10 for $10 including shipping and decided to test one to destruction so hooked two 12V batteries in series an using one of the above buck converters started with 12V took the array up to 14.8V for a day (converter and solar controller take it to 14.4V once ever 24hr for 15 min, and no change gradually worked it to 25V and after about 15 min three of the SMD's unsoldered them selves and the fell off, but the rest still worked. I no longer worry much about their current!
