Am I missing anything?

I am going to be starting soon. Am I missing anything? Details below.





4X4X7H 400W HPS
I have an extension cord ran to it for the pictures, but this weekend I will be wiring a dedicated circuit to it for power.
I will be growing hydroponically out of four bubble buckets, with 2 air pumps pushing four 6" bubblestones. Hydroton for my media, General Hydroponics nutes as well as PH balancer. I have a PH meter, as well as a PPM meter as well a temp/humidity meter hung up inside.
I have made an 8" carbon scrubber which reduces to 6" which I have running on a 6" booster fan from the Depot and activated carbon. I was going to get a vortex fan, but so far after testing this one works and creates a negative pressure inside. I think I might still purchase a vortex fan soon though for when I enter flowering (when the stink kicks in).
The walls I did in duct wrap insulation. Where I live, its cold in the winter and this is a basement which gets around 45-55 F during the winter nights.
It isnt mylar, but it gives good reflection and will keep my babies warm. I will use the light for heat and i'll be using the exhaust fan on a cycle, or by thermostat (will be testing both out once hard wired) to keep an even 70 something temperature. Some preliminary tests i've done have shown it takes a good 25-30 minutes for the room to drop 5-6 degrees, so i'm working on a 30 minute exhaust cycle now give or take. How much of a temperature swing can the plants handle without stressing the hell out of them?

I've been reading for months, and have taken my time with all this. I grew 2 indoor soil grows a few years back which went well and this will be my first hydro attempt so i'm trying to do it right. I ordered some seeds a few months ago for a friend and I, and have a few to choose from. I am only growing four at a time, so I would like to keep them somewhat similar in size so I can get the biggest bang out of my lighting.

Heres what I will be growing:

1 - Nirvana Seeds Wonder Woman Fem
1 - Barneys Farm G13 Haze Fem
2 - Seedsmen White Widow Fem


I'm hoping to start the germination next weekend.

Your biceps. Unless you have the attachment separate from the machine.


Seems like quite a long time to exchange the air in there. I have a 4x8x8 room and it takes about 4 minutes to drop it from 76-70. I've read that you don't want more than 15 degree drop from day to night.
Are you bringing the intake air in from that basement? It should cool down real fast in there if you are bringing that cold winter air in. Are you putting a heater in there for nights?

I'm sorry, that was supposed to be rise, not drop. The drop is fast, as you said. It takes around 25-30 minutes for it to rise back up with the light as the heat source.
Do you think it would be hard on the plants with a 5-6 degree swing every half hour? I plan on adding a small heater for lights out, I dont have a choice on that. I have a small space heater with a thermostat, and I have a thermostat wired into a 120v control that I could also add to it as a backup so i'll have the tstat on the heater, and a tstat on the power source to the heater as backup. I'm a nut about fire safety.

The bicep/curl portion of it is there, its just a T-bar on a chain that sits on the floor when not in use.

Working well.