There are many inferior LED lights being sold on ebay. Best bet is to deal with a reputable company such as
http://www.customdynamics.comYou could also research the
http://www.superbrightleds.com/ site for components. I have made several purchases from them over the years and their quality is excellent.
Locally, several riders are using lights from
http://www.watsendesign.com. I do not have technical comparisons for them as compared to incandescent units, but all who see them for the first time agree that they are super bright! As for the ordering lead time, it has been that way for at least a year now. He cannot keep up with the demand.
I'm very satisfied with the Rizomas which the previous owner of my bike installed, but if I were to install a new set they would definitely be Watsens.