Hey guys, About to bite the bullet and place a pretty large and comprehensive order at greens. I'm swaying towards the Secret Jardin DR90. The dimensions are 90x90x180cm. Would you advise me to get a 400 watt bulb for this area, or 600? I can't really afford any more than a high powered 5 inch Ruck fan which pulls 365cm3 of air. Also will buy a simple Euro Reflector for these reasons 1. Cool tube loses some light. 2. Cool tube or a air cooled hood may overheat my fan as hot air is going directly to fan 3. Euro reflector has an open ended design so I assume are cooler than a closed hood system 4. Can adjust flaps to direct the light more efficiently to the grow area inside the tent. I don't want to buy another inline fan as I want to keep my order under £600 and I am already at approximately £550. I will buy an oscillating clip on fan as well. Also bare in mind I will be 'growing' in a 2x2" or 60x60cm area inside the tent, and in this space I will SOG 9 plants in 6.5 litre pots. As the light will be directly under the 2x2 tray and as the 400 watt bulb outputs 56,000 lumens this would provide 14,000 lumens per square foot to the tray if I direct the light well unless I am confusing things. Could anyone kindly advise me on whether I would easy handle a 600 watt bulb in that area or is it just a waste of electricity? The cost difference between 400 and 600 is negligible. In both cases I will be buying a dimmable ballast. To be honest I am leaning towards 400 watt. This is because 1. it seems to me that the 600 watt is overkill 2, the 600 watt ballast can only be dimmed to 360 while the 400 can be dimmed to 250 and therefore I have more ability to save electricity during veg period, and 4. more control over heat during the hot summer days as I could reduce to 250 watts. But reading these and other forums people swear by 600 and claim it produces far superior yields as well as being able to penetrate the canopy much better. Please help! The tent will go into a basement which has a small opening at street level which will allow fresh air into the room. I will vent straight up to the wooden floor boards on top the basement as as there are gaps in the wood and it would help heat the house as well. Any thoughts on this? Could rotting be an issue?