What's your budget?
I would seriously consider building your own light. Very easy, basic tools, top quality, last for years....
The problem with the Ebay leds, is that they are more than likely Less efficient than a HPS of similar wattage, which as someone commented is around 110 watts....
So if the 110 watt light was 25% efficient overall [still better than cfl], you would have about 27.5 watts of useable light and 82.5 watts of heat....
These lights also usually have little to no heatsinking. Usually an aluminum pcb plate that all led's are soldered to and then fans create active cooling.....still this can lead to hotter LED's at the Tc [junction temp, where the LED and metal/Tim meet...and doesn't help when more heat is also heating up ambient air [Ta].
An 150w HPS is probably about as efficient and maybe a touch more so with a new bulb....but after your 1st cycle, the bulb will start to depreciate in efficiency....
Quality diodes that you can build and select your own colors are readily available....some I run for instance are over 40% while running about 18" in height over plants....
You could easily run a softer driven LED [less current] in a shorter space and still get maximum penetration and coverage from your own fixture...