I would consider the ph in the change if you are talking ~300ppms.. what is your medium? How often are your flooding, and for how long? 1200 seems right on par with what I've read on enf,
Something else to consider is trying to get a 2-for-1 deal out of things...
if you're slightly underfeeding and your ph is 6.2, throw in some nutes and take it to 5.8.... lemon juice, baking soda, all good 'adjusters' I personally love Protekt as a additive/buffer/PH Up
Beneficial Additives in Hydro
Sorry I do not mean to jack, but that is a good read to come back to at times. Im also going threw some of Brewer's old journals and a couple long lost Scrog threads...
Guys, I sent chaz a pm that I probably have just posted here and not of harassed him.
-I noticed IG's PAR charts have a very low curve relative to what I am used to seeing, is this related to the units measured or something else?
-How long do the 660s stay on the pontoon?
-How in the piss are people running a 420 in a 3x3? I / I <--??? (catch that? ha!)
-I did not see anywhere to purchase replacement bulbs... I understand the lifespan's supposed to last longer, but how much longer before you start seeing diminishing values? (on my apogee) or any other unit of measure (eyes... lumens, whatever)
I do love the ten year warranty, its nice to see confidence in products.
Im not in the position to buckle down and get one tonight but maybe down the road it was be a nice Cool White source. Hyroot really got me with the Even Distribution thing.. Im looking at IG's charts and I am still a little lost, but get it. I love the slight peaks, complements what both, mh and hps, are lacking..
Good luck John!