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despite your stretch issues, how is the overall quality and yield ?

Rahz, first let me say I'm impressed with your initiative and your results. I mean, 1.8g/w in less then 5 sq feet , considering that they grew out of the box, is amazing. What did fed to them ? Next time you may try adding some plywood on the sides of your boxes :) Since you are gonna make a...

Hummm... using an air cooled hood to warm fresh air inlet would be really cool. Using all the resources from the light, not only its photons but also recovering the wasted energy/heat. Unfortunately for me, that's not an option. When the outside temps are 90-100f, you want as much efficiency as...

I'm pretty new to this, but it seems that Cree 3590 setups use about 30-40% less energy then good quality HPS. Its not only lm/w effiency, there is no IR, its 180 degres instead of 360 and so on... Considering you are using 2 600w hps, you should be pulling 1260w(5% ballast) from the wall. So...

https://www.amazon.com/Roleadro-Greenhouse-Germinating-Flowering-Generation/dp/B01IVQ96WW/ref=sr_1_7?ie=UTF8&qid=1483035245&sr=8-7&keywords=cob+grow+light