I built a COB lamp using CPU's cooler I took from Amazon. Arctic cooler with fan can dissipate 100W heat made by a 100W COB. Of course not all the power goes for heat. It works well!
Paolo
Kratky system is cheaper (no pumps, no air). I'm testing some plants, this
is a Rocoto 91cm wide. I took this picture on 04/14/2016, seed started on 01/08/2016.
Thank you again!
I use GH because I cannot find Masterblend here in Italy. I use CalMag and Epsom Salt too.
My solution is between 700-1000ppm and 5.8-6.2 pH.
Your plants have more roots than mine. I must understand why...
Paolo