400 for 2 weeks, 600 for 3 weeks, and both til finish.=P but of course I know nothing of your ventilation issue.

And for my opinion to your question.:jointsmile:

I'd say the more mature plant that already has flowers and plenty of resin on them will reward you more under the 600 until finish.

Consider just a smaller add on of a flower room for the 400? Maybe a clone SOG table? :jointsmile:

Veg enough large plants to overfill your current bloom room, and cut them back enough to fill your 400 SOG table.

Or just do the 400+600 super scrog in your current room.=P

Either way, I've had many many :rastabong: rips and I'm just not finding a closure for this response. :stoned:

beSafe
BeFree Reviewed by BeFree on . LIGHTING ARRANGEMENT FOR FLOWERING I currently use a 600 watt hps and 400 hps for flowering. They run side by side on 4 foot tracks. I currently have the younger plants under the 400 watt lamp and switch them to the 600 watt lamp for the last 4 weeks of flowering. I am wondering if it might be better to switch the arrangement where I start the flowering on the 600 watter and finish up the last half on the 400 watter? Rating: 5