Yeh during this summer I sorted all the heating issues by trial and error multiple times..eg
Trying to save power in different ways
CMH is allegedly running cooler mmmm ok yeh right I spend 700 buks on CMH bits n pieces, yeh in summer run 7 degrees C hotter that ambient intake temperature with an external ballast mmmm ok thanks for that internet..
Next ok let try and led yeh so grab a 320 w mmm on not bad good for veg, still running at 4-5 degrees above ambient temperature, so need to be turned down some days especially after 8-9 am.. yeh saves power is ok. I like my hps buds you just cannot beat it for chunky and that what I'm about chunky bud. So the bottom line it seems the best way by trial and error
320w led veg and adjustable in hot times ( thing is when this is running at 50% to run cool it's lost all it's punch whereas the hps running at full blast and only 3 degrees above)
400w hps summer or hotter months, 600w
( my favourite) winter and cool time eg April to September approx
CMH UV lamp at intervals in middle of cycle depending on temperature, I'm just going to run it on the side as a supplement kinda thing during the last 2 weeks the recommended so anyways it flexible that, but it's a good lamp real purple tinge
I tamper with the room the lights ect depending on the day if hot sometimes run fan to pump hot air out... I just hate summer