Every watt is converted to heat regardless of electrical efficiency...I.E.: how hard you push them. 300w of 10% efficiency and 300w of 90% efficiency...is all the same amount of heat into the grow space. One just gets to play around as some light before converted. Thermodynamic...you know part of the physics you claim to know better than all.
If you were actually educated you would know that...troll.
No one is talking about driving in some under hps efficient way...so keep eating your foot.
@chuck estevez A watt is a watt and they all have the same btu output...3.412BTU's per hour no matter what the efficiency of the source is. It the ability to use lower wattage to create the same amount of light that is "creating" less heat. Still needs to be dealt with. But with the ability to produce such high amounts of light per watt will let you drop 35%-40% in heat loads via wattage drop.
For that cx300 at 330w from the wall...x3.412= 1126 BTU/hr including fans, drivers, everything.
Chuck, I know that you do have a real interest...whether you use or plan to use or not...you do want to see the real info and results...I know/feel that of you. I will/do/have treated you as a curious mind open to the info and am not trying to pull anything over on you or anyone, or even forcing the use of them down anyone's throats. Just putting out the info to their successful use for anyone to make their own decision.
I don't mean to come off to you like I do purposefully to the trolls if I have.