My 2cents...dont rely on me, just food for thought. I am a fan of a deal. However, I have cut corners in previous years to get the price down. I understand for most folks including myself, spending alot on our tanks will get us shot by the wife! I have destroyed my tank 3 times cutting corners. I bit the bullet and started acquiring more quality products. I am not saying radions or anything like that. Before you consider an ebay led, look into the folks who actually make the things for our tanks. I have a MARS LED unit....not for aquariums. Their main products are for horticulture. I am not bashing these LEDs, but I recommend you treat your lighting just like everything else you put into your tank. Get the best you can.
Reefbreeders have excellent LEDS at a really good price. I personally Have onyx fixtures by rapid LED (apex controllable). The ebay Chinese LEDs may be fine, and may be the deal for you, but explore the ptions a little bit.