Here's the closest thing to what I got that is on their website. I actually ordered it through sourcing map and they don't have it up any more. After I got it and played with it a little there was a series of mails back and forth with them in extremely broken English and Chinese (we were both using google translate) to determine the lowest voltage (6V) and the highest (12V) instead of what's on their site. Seems there was a mistake somewhere. I paid practically nothing for them; I'm unclear on the exact price though because there was a few cents adjustment after shipping for currency differences that happened during the day or so it took to get it actually ordered.
http://www.microtek-led.com/ArticleShow.asp?ArticleID=116
So, you see that the voltage, 6-12, was right in the sweet spot that the arduino likes and its regulator would take care of the voltage, and of course, experimental results were different from either the specs or the conversation. I was pretty bummed when I saw how much noise it puts out, but nothing ventured, nothing gained.
Letfy, you're right, no one (well maybe me) would want to put a perfect constant current supply on any device that has some limits on acceptable voltage; it would blow up in a heartbeat. However, there ain't no perfect CC supply, and this ones parameters showed possibilities for a really cheap and easy power supply.
oric, you don't have to do this. I never suggested you do this. Don't do this. For crying out loud, I brought up a subject for discussion and got attacked like a teenager that told her dad she got a tattoo on her face.
I asked for thoughts, not a diatribe.