I'm putting a 400w in tomorrow. Thank you.they are kinda right about 600w being too much i think. 80cm is about 2.5 feet which would be 6.25 square feet which would be 100 watts per sq foot which is ALOT.
a 400 watt bulb might be all you need in my opinion. see if they'll swap you out bulbs?
I'm going to try the temp on 600w setting and will post.i'd still want to know how a ballast at only 100F is shutting off though. their answer to that is bullshit for sure