Some info I got from the adjustAWings:
[...]
I designed the Hellion 600-750W to be the best performing 600W unit on the market,,,,, and it has the added bonus of being able to be super boosted to 750W if the grower feels the need.
Run the lamps between 45cm & 70cm above the crop, depending on sensitivity of plant growth/development stage.
Try growing on 600W setting at all stages except for week 4 to week 7 of flowering. Give them a super boost to 750W setting from end of week 4 to end of week 7.
See last pic, 6 x Hellions in a 2.4m x 3.6m tent, run exactly as I suggested above... The grower also installed 6 x LED panels to enhance the undergrowth in last 4 x weeks. Yield was 7.5kg.
[...]
The picture that I sent you yesterday showing 6 x Hellions in action. That came to me from someone very close to Gavita. That tent was originally set up as a 6 x Gavita 1000W DE experiment.
The grower informed me that the Hellion 750s yielded slightly more than the Gavita 1000s and the plants were healthier, more even in size & maturity & potency.
The Gavitas were too hot & had to be dimmed to 600W for last 3 x weeks. . Same 6 x 285W LED panels were used to develop understory in last 4 x weeks.
Further, we do most of our testing with PAR meters & I really hate those things because they are retarded at measuring angular light emissions.
Even though the Epogee meters with “cosine correction”... Yerright, what a load of crap. I measure up to 60% difference in meter readings by tilting the sensor 10 to 15 degrees (should be < 3% difference going by epogee manual).
And don’t get me started on radiant heat / IR etc...
Anyway, the only reliable test is a biological/plant growth test !!!! And if you can get side by side comparisons within the same grow room, that’s gold.