I bought
~~one of these~~ in december. One of the 4 led's stopped working after about 5 or 6 hours use. I returned it to the supplier (light unit only, not the whole lot at their request) at my expense. After a couple of weeks I had to remind them that they had not sent the replacement.
At the beginning of this month it went wrong again. It would fire up but then turn off within seconds. I got back in touch with the supplier in the link yet again and they said basically , 'tough, its outside our guarantee time'.
I am now at the Resolution stage via fleabay to sort it out.
Shame really as its a really bright light. If only it would work.....