Ask them for the exact led manufacturer for the specific wavelenghts (400<--->700nm)and Bin #'s............If they get back to you(which I doubt)post it here and we will give you a better opinion.
Second NO reflector(primary/secondary) design gives you 100% reflection of the light output===BS!..........always will have losses and vipar's panel may be up too 20% with those pmma covers.....
I have the old A300 and the new B2x3 and the newer models really seem more powerful than the older A models and as someone above says not the best on the market but you really get your bang from your buck. Also I have noticed Vipar has other cheaper models series for sale on ebay but not on the main website.