I think DB just got his 300 W PSU but in a 5 X 5 or 4 X 4 two of the 240 much better. Have you tried dimming the lights under veg? We have a new product coming out that is a Sensor Hub - gives you heat and humidity readings and attaches to your PSU for wireless dimming. App for phone so you know environment from anywhere. It has a dashboard that will provide you with VPD calculations as well. You want to have one for each 240 W for your set up? Will get DB one for his 2 X 4 test as well.