Thanks D!
Even it I fail at my first cloning attempt, I'm sure I'll learn something to apply to my next try.
I taped the cardboard to the sides of the pots as windbreaks to protect the leaves from transpiring excessively as the oscillating fan blows back & forth.
I also had to tape a small piece to the intake fan because it was blowing quite hard on one of the plants as they've grown tall enough to get more directly into the air flow (sucking air from an open window behind my growbox, and it's about 40f at night).
I'm doing 18 hours on & 6 hours off (off at 6-am, and on at 12-noon).
The intake fan is thermostat controlled, and I manually operate the exhaust fan to turn it off shortly after lights-out, and turn it back on when the lights come on.
Keeps the lights-on temperatures at a comfortable 78f, and drops down to about 65f to 68f when the lights are off.
Instead of sealing the ducted light hood with the glass plate I bought for it, I let the exhaust fan suck out the hot air from the growbox: with the glass in place the temperatures get out of control real quick unless I use a bunch of fans, which gets really noisy in our small apartment.
Hope you have a good Friday!
The "Avatar" DVD came in the mail today from Netflix, so am about to watch it (probably the only sci-fi nut who has yet to watch it).
Peace!