"dead on time" - Brilliant!
Doesn't led work with a rather cool temp? The only way you can control temp is to move air through the grow box. Frankly, if I had to use a grow box, I wouldn't. But if that's what you want or need to do, that's fine. Just make sure you have plenty of air flow to control temp and move in fresh CO2. Are you sure you don't want to try potting soil first? I know you spent quite a bit of money on this setup, but usually for a first grow, soil is more stable and easy to use. But feel free to use the hydro method. It just requires more attention, like your metering several times a day to see where you nute mix is at in terms of pH and ppm. I would use 12/12 lighting for flowering anyway because doing so will save you money on a power bill. If you need to force the smell through a carbon filter, which you already have, but find that you need to move more air through the growbox, then you'd have to blow fresh air into the box, not try to bypass the filter by putting in another exhaust fan. I hope the fan you have is enough to handle the airflow needed. When flowering, these plants always get very stinky and dealing with the smell is one of the bigger problems for a successful grow. That's the kind of problem you want to have, right? Then you did something good. You don't want to get much warmer than 76F for an indoor grow. Has all of your supplies arrived yet? Did you purchase them from America?
Hello Weez, you natty surfer, beautiful pics.