Contrary to the auction title, that PSU is not an LED supply at all (a constant current supply), it's a constant voltage supply. You cannot use it to drive LEDs directly. There are Chinese Ebay LED supplies (constant current supplies!) also available, and they work OK when properly cooled, at least for some hundred, maybe 1000 hours.
Those kind of Ebay LEDs are sometimes OK, sometimes not. Often, they provide much less light than specified, mostly generating heat, approaching incandescent light bulb efficiency levels. But sometimes you are lucky and get a usable LED with possibly near 70-80 lm/W.
If you want to play around with the Ebay stuff, I'd recommend you get that kind of 100W LED, and buy a 50W constant current LED driver for it. Then, it will drive your LED at only 50W, increasing the lifetime and efficiency a lot. Be careful with the mains powered stuff, they can be, and often are, fatally dangerous. Mount the LED to a good fan-cooled heatsink, like something bigger designed for power-hungry CPUs. Mount the PSU so that the fan cools it down, too, then you have decent chances of the elcaps lasting for more than a few hundred hours.