i cant really say about the rise in temps with your 400w but two different posts here mentioned that they had an 8 deg rise in temps in their closet/boxes with the light. it depends, will opening the window let in hotter air than what you have in the room? it sounds like a good idea to open your attic door since heat rises. hope this helps. i cant really be specific about this because my light is smaller, most of this i just found out buy reading others posts and magazines. sorry about your BB. sometimes seeds are good.
twoguysupnorth Reviewed by twoguysupnorth on . Starting my first Indoor Grow! hey everyone. I just started my first indoor growing system last week. I am using a hydrofarm 160 watt vegetative bulb, foxfarm organic soil, and some kick ass nutrients called "Heavy Harvest: Advanced Nutrients" (this shit rocks!! also growing 6 outdoor:4 neville's haze, 1 blueberry, and 1 big bud using this stuff. Beefy ass stems! will post pics within the next few days). In my indoor system i am growing 2 Blueberry plants and 1 Neville's Haze. i am also germinating 1 more blueberry as we Rating: 5