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I have used a bubbler and Hydroguard for years with no root issues. Simple is good.

A variac is the best exhaust fan speed controller because it just lowers the A.C. voltage to your fan. It does not modify the sine wave in any way. But cheaper than a variac is to wire a 20" box fan (like from Walmart, Lowes or Home Depot) in SERIES with your exhaust fan using a duplex...

I grow in RW blocks a lot. The bottom block on a stack is supposed to heavier due to the "moisture gradient." When I started, I weighed the dry blocks, and then weighed them totally soaked. That way you can tell when they dry down to about half weight - then water them again. It makes the...

Half a ML a gallon per week is waaaaaaaay cheaper than hydroguard:mrgreen:.

Ive heard nothing but good about that product. How much do use per gallon?

2 ml per gallon.

Hydroguard is your friend. Never had a root issue in dwc since I starting using it 5 years ago.

Nice looking buds! What do you feed those girls?

And one more time...How long do you run the 5w of far red in a 2x4 tent for EOD treatment? Thanks.

A little aside, I'm using a GM5 puck in a 2x4 tent. I found 5 min. EOD was to much. Lots of stretch. I cut it down to 1 min. And got a faster finish and minimal added stretch. Doesn't take much to tell the girls good night!

So in your second pic, do you grow them out in those saucer-on-saucers? If so, any media under the top saucer?

Nice deep green. No tip burn. Leaves look good. I second Moflow's recommendation to go for 40,000 LUX in flower. *Just my opinion!

Interesting aside...I bought an Apogee PAR meter and the readings are about 20% hotter than my lux meter readings. I was wondering how I was getting such good results at around 600 umols. Turns out it was a really around 720ish umols really. So as you said, 40K lux is very productive and is...

Great challenge! How low can you grow! So how many inches from the floor to the top of the media? And how high is the net from the floor? Thanks.

Just a test? Or will you be doing more 5k runs?

Look on the first post of this thread: https://www.rollitup.org/t/quantum-board-qb-288-v2.964936/

And no calmag or bloom boosters? Also, do you use the factory mix or the 321 mix? Thanks.

If grams per watt is the criteria, I don't think the horticultural cobs are going to be anywhere near TWICE as productive as your basic 3000K/80CRI cob. What do you think?

Im really pulling for GML and LEDs to take over the world!! But NO! Another blunder. Another apology. How long before they get some good help in the garden?

A hundred panels? Sounds like you're making some friends! Are you using a heatsink from Heatsink USA? If so, please include type and size. A picture of the fin side would be nice. Seems panels and strips are the rage, and I have some, but I started with and still use Vero 29s version 6 in...