The pump is pushing water, but a small ~ 2-300gph pump is more than sufficient for a small grow. There is a lot of resistance in the < 10ft of 3/4" pvc tubing: the 4 mist heads are the only exit points. Assuming you are not using too many heads, then ample spray. I actually have too much with a single pipe. The nutes are overshooting my APs. Gonna try some different heads this morning
I am feeding ~ 23 sec/hr. Both are adjusted by how the plants look
Feit also makes the Utilitech bulbs, which now that I took the globes off (destroyed in the process) won't be returnable, BUT, my sense is drivers failed, and those are easily upgraded at the factory once they see a high return rate. Also keep in mind anything 21 months old is probably 36 months old, and think how many driver choices since then. My guess is the newer bulbs have upgraded drivers these days. Time will tell