I'm planning on upgrading from cfl's to LED's and for my price range Platinum seems to be the best bang for my buck. I'm looking at either a P300 or a P450, my cab space is 3'x22" so a P600 I think would be a waste as it's several inches narrower than either the 300 or 450 and would barely fit on the long end. My question is, would the P300 be sufficient for 3 plants thru flowering? I'll go with a 450 if it's in my budget but it's nearly $200 more so if the 300 would work I'd rather start with that. Just looking for input from anybody running LED's, especially if you're actually using Platinum's. Thanks in advance for any input.