Im still not convinced on leds.A 400 watt heat is easy to control thats what i use.To me if you got the money for led then you can get a 400 and vent it for the same price.My problem with leds are the cost and i still dont feel like they will produce more bud weight.People will argue that it does but its yet to be proven.Yeah i've been looking at the 400w hps and im pretty much set to go with that. I'm just a little concerned about the heat in a small space. So i'm thinking if i can get LED equivalent then should be all good. I could probably go for 100w plus LED seeing as heat isnt an issue with them.
And cheaper.Maybe i'll got the vented 400w hps for a few grows then look at the LEDs. like you say the single light is easier to control than all the LEDs.