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You'll get wider coverage and higher lumens/watt by running 4 emitters at 700ma than 3 at 1050ma. I run my cobs low current and spread them out for that reason. The only downside is the upfront cost for drivers and emitters but some of that is made up by higher efficiency. The wider coverage...

You'll be needing some good heat sinks for 20 3070s. I recommend http://www.heatsinkusa.com/ if you want to drive more than one emitter at a time or you could use one Arctic 11 CPU cooler per emitter.

I am assuming the term DC/AC implies that the timer will run either 12v DC current or 12v AC current. There is no indication from either of the diagrams that this timer has an internal AC to DC transformer. I would still power it up with 12v DC to check the function. Tinker on...

You're welcome. None of my creations look like the original plan. Tinkerers never finish. We tinker.

I have lots of 12v dc experience. Battery goes to power side. Drivers connect to the switched side. The diagram is lacking alright and polarity is important here. I would just connect the power side to a battery and check for voltage at the switch side. Just make sure the timer isn't in...

It is great stuff. If temps still go above 70 you can always use frozen water bottles, changed out as needed, to keep it around 68. Before I got a small chiller I did that for several weeks in the summer.

I don't know if you have insulated your reservoir or not but it helps to keep nutrient temps lower. The reflective bubble wrap like you have at the base of your plants is what I used.

I couldn't agree more, Pet. Those of us that drank the red/blue Kool aid early in the led grow revolution and then 'discovered' whites get it. Not that predominately blue/red was a complete failure it's just that predominately white grows more and better. My overall yields have improved by...

Thanks. I use a 1/2" bulkhead fitting mounted about 2.5" from the end of the chamber. The chambers drop 3/4" per foot which makes them drain well. I also cut the drain end cap in half, silicone sealed the bottom and attached the top with small plastic hinges I bought at the local hobby shop...

Here's a picture of it a bit over a year ago. The picture isn't real great but you can get a good idea,how the system is made. I'll try to take a picture of it soon. At that time I was using mostly monochromatic leds. Now I am using mostly 2700k and 4000k whites with added 660nm (switched)...

I use 1 tablespoon of Epsom salt per 10 gallons every change and a 1/4 dose of CaliMagic. The reason is that I tried using CalMag only and still ended up with a magnesium deficiency. Also, most good nutrients for both veg and bloom have enough calcium or close to it anyway. A little extra...

I would just spray them every 2 or 3 days until the plants are healthy looking. Foliar feeding is a bad idea in the last month of flowering because it can lead to bud rot. Red stems may be genetic but it is one of the indications of mag deficiency. Red leaf veins are almost always one. As it...

Your girls are definitely looking better! It takes a little while to correct a mag deficiency and using foliar spray like you have been should get you there quicker. How is your nutrient water supplied to the root chambers? Internal spray tubes? undercurrent? flood & drain?

Any leaves damaged by a mag def will not recover but new growth will be fine. Correcting the def now will ensure that the new leaves stay healthy. Also, you may want to lengthen the off-time to 45 minutes for your water pump for a few days at least until the wilty one gets happy.

I run a system that's similar to yours. I use an adjustable cycle timer (CAP ART-DNE) and have found that 30-45 seconds on every 30-45 minutes is just about perfect. In the last picture the wilty plant looks overwatered. Shorter, more frequent watering should take care of that. It looks like...

Just make a small jumper wire to short around each diode starting with the closest one to the + input. Power it up and check them out. If you have a bad one the string will light up when you bypass it. This is assuming they are now wired in series. I've made the mistake of getting one in...

I was just about about to write something similar! It definitely needs magnesium. At the current stage of growth it could go either way. If corrected now the plant will recover and yield well. If not...well not so good. I use Epsom salts @1tsp/gal. I just dissolve it in small amount of hot...

Nice grow. Barneys Vanilla Kush is excellent smoke! FYI that strain needs more magnesium than many others do. Even with more than the usual amount of Cal-Mag, I developed a severe Mag deficiency with VK a few grows ago that nearly killed my plants and reduced yield significantly. The next...

The 5000k cobs are pretty much the cat's meow for clones. I had a similar experience. My clone light uses 3 Vero10 cobs driven at 350ma which works out to 24 watts at the plug. The clones really do well under that light. I also grow a mother under 48 watts (at the plug) using the Vero10 cobs...

Honestly, if you can get an all 5000k white light you will love it. 5000k has plenty of blue and red in the right amounts as well as the rest of the par spectrum needed for veg. After all, our beloved plants evolved under the sun which could be described as white light. 5000k is what I veg...