Dude, i had the same problem as you did. I just tucked some cardboard under the hut and folded it upward. It creates a barrier to catch the light. I have vents on all sides x-cept the door side. Check it out. The fifth pic is the way i'm dealing with your light problem. It doesn't stop the airflow, but it stops the light, which is good. The first pic is the AK-47 mom and second my Ultra Haze #2 we grew from seeed.

About the ducting leaking light...I extended my ducts outside the hut as well, so light doesnt get in. The 4th pic is the top exhaust vent. I used the moveable joints to make hade bends in the ducting which i hear is important for good air flow. The 5th pic which is the 6" vortex connected to the 1000k hps, you can see I used a reducer to shrink the 6" to 4" for easier ventilation out of the room. I'm using the vents in the walls to disperse the air in other rooms. Sometimes I get a whiff of dank in my bedroom. Its kinda nice.

We got some troublemaker with our order from dr chronic. None of the seeds grew tho. I'm ordering bogglegum f2 from mastergrow. Hopefully they aer sweet.

How is the negative pressure from the squirrel cage? You see on the last pic how the canvas is sucked in, Its like the 4" vortex is pullin out more air than can come in. Is this bad?

I like you setup. I would like to get some more side CFL's to add in the mix. I would also like to try two 600 hps cooltubes or the same case i have now just 2x600w instead of 1000. I wonder If the 6" vortex would cool two 600 HPS? I dont know. Right now our second grow is going ok. The plants look a bit hurting, but are doing fine. MAybe I'll throw some pics up soon. They are starting to gte some nicve buds. Im lazy so im not fixing my typos anymore.

Peace good luck. I'll keep in touch.