Interesting. Yeah I saw the Honeywell recommended on thread some time after making this post. I had a large stand-up Honeywell fan that was a huge POS too. Funny.
The Honeywell fans placed under the vertical bulb should be run on the low setting, you want to assist the heat rising and on high it causes to much turbulence and ends up blowing the heat back down.
I use Hydrofarm Active air they where cheap and have been working for 2 years now no problems. I have a 6" and a 4". The 6 is on my Scrubber and the 4 is my exhaust