Welcome to my new grow Journal. This is going to be my second grow using the following: 1- 400 Watt Dimmable Electronic Fan Cooling Ballast; Acceptable input: 110v - 240v. Dimmable Option: 50%, 75% & 100% 1 - HPS Bulb: Lumen - 53,000 & 1 - MH Bulb: Lumen - 36,000 1 - Cool Tube: 25" x 6" Duct Size: 6" Made of Glass and German Aluminum 1 Gotham Hydroponics Inline 4inch fan + Scrubber Grow Lab 60 2x2x5 Tent Ducting 4 & 6 inch 1 additional 6inch clip fan Media Fox Farm Ocean Forest Fox Farm Light Warrior Nutes FF Grow Big FF Big Bloom FF Tiger Bloom Ambient room temp is about 72 degrees and my tent is located in the corner of my room and is very silent. ---------------- THE SETUP: I have my Ventilation set up as follows: FILTER(SCRUBBER) > INLINE 4INCH > 4INCH DUCT > DUCT INCREASER 6INCH > 6INCH DUCT > COOLTUBE > 6INCH DUCT> OUT(through the top) Ambient temps 72 outside of box roughly, inside temps with MH on is roughly 84-86 degrees. I have a fan in the middle of the plants aiming at the cool tube. I have a speed controller on the inline and i rarely have to move it above medium to cool in such a small area. The Cool tube is actually to big to fit horizontally across the 2x2 tent so i hung it diagonally as show in the pictures below. Light coverage is 100% for the area that i have provided. THE GROW: As you can see i started these guys started out under a 150 sun systems hps and i was not happy with the heat and power consumption that comes with that unit. I'm currently selling this thing on craigslist for 40 bux lol and i have repaired the hole in my closet.