those fans are great cause once you get the filter on the out end, it acts like a silencer. At one point i was running 2 and could still sleep next to them .
how centered is your bulb in your new reflector? I have always had to add some type of extension to help center mine.
hydrofarm (and I am sure N-g-w) sells a mogul to mogul adaptor part number CSMOGAPD suggested retail $7.95