Hey Reaver,
I am very new to growing, the light looks OK to me but some of the specs seem inaccurate. They say it has 90 x 3watt LED chips so pumping them at full power should at the very least draw 300 watts from the wall but its rated for half that? Anyway this could be a good thing in the end if they run them at half power, either they had problems with the chips lasting longer or heat problems.
They use LED's with lenses, added a secondary lens which is OK, the first lens on the LED chips would help with their efficiency but you would lose about 10-20% when going through the next one.
With the unit drawing about 150 watts from the wall, you might be getting anywhere from 100-130 watts into the LED's and then say if the LED's are in the realm of 90-110 lumen per watt, you could be getting maybe 12,000 lumen at about 12 inches.
Your question is 150 watts going to give you the light power you need? its hard to say with out testing, but if we take into account the worst case, 100 watts into the LED's and dropping the efficiency down to say 70 lumen per watt after the second lens you could only end up with about 7000 lumen at about the 12 inch mark and then your looking a roughly a quadruple loss in intensity every time you double the distance, the lenses would help with the drop off but still if your only getting 1700-1800 lumen from 3 feet away I don't know if that would be adequate for 3 plants?
Price wise I guess its not to hard of a loss at about $600 US if it dose not work out but I would look for a panel with more technical specification, specifically the efficiency of the LED's they use so you can better gauge the final intensity you would possibly getting.
The biggest question really is why did they use 90 x 3 watt LED's and under drive them by about half? Also high quality 3 watt chips with high outputs say 70-110 lumen per watt should cost maybe $4-$7 each, which wouldn't leave a budget for much else if that's what they used, I imagine they would have used relatively cheap LED chips and could only be in the range of about say 30-50 lumen per watt or less? I think the trick here is under driving cheaper LED's can boost the efficiency of the LED's they are using, so in the end its about half and half for me. If you are a bit of a handy man you could build yourself quite a nice panel for the same price?