LED UFO's Anyone Success?

Hello, everyone! Yes, it's another LED grow light question! I'm highly interested in purchasing an LED grow light on eBay, and the price is unbeatable. They're marketed as LED UFO Gen. 3 with "improved spectrum," which apparently is 662 (r), 430 (b) and 642 (r), 453 (b) nm between all spectrums. Realizing that only a few nanometers +/- can determine whether a grow light is worthless or not, I'm very interested to tell if this is the proper spectrum required. Can anybody give me advice, input into this matter? Also, has anyone used them with success? Thanks, Wolf.

Not one person has used these or knows if they're reliable? I tried finding other LED posts, but the search never works for me.