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I decided to go with 10 citizen 1212s in varying color temperatures (4000k, 5000k, 5700k and 6500k) on an HLG-320. Total build cost will be like $300 including the heatsink I source at goodwill. Excessive? Maybe, but I like to think if I move out of a tent then I'll grab an extra few square...

What versions would you suggest? I'm going to start with 16 strips on two 2ft long bars. Ideally I'd like to run them off a single driver per bar, or just least drivers possible .. I'm looking for the cheapest option as far as drivers go, which is what made the laptop charger thing so...

Yes you're right, you will have better luck with your version because of the casing, I think.

This project is so freaking awesome man. I'm going to wait until you work the bugs out, but after that I'm going to follow suit! Thanks for a great guide and contribution.

Can I use an MH-Z19 instead?

Correct I have a 4x4 tent for flowering :D

Agreed, I like big floppy fanleaves especially nice if shit hits the fan and you need time to react. Should I just do a mixed temp light with some 4k, 5700k, 6k?

I see people trying these new 5000k, 6500k and 6700k lights but I also hear people swear up and down with 4000k. What's the verdict? I'm about to pull the trigger on 8 cobs for a 2x4 vegging tent.

I was shocked you managed to grow these fat bitches with such short veg! Nice work.

@robincnn were people saying you could butcher an old laptop charger and use that instead of a driver for these strips? If so I'm going to be raiding my local Goodwill..

I'd like to build 6 panels of these for side lighting. Anyone have driver recomendations? I think I could do two strips per panel so I'd want to run 2 strips per driver. I'm not sold yet on which rigid strip I want but I'm gonna most likely go with the cheapest solution :bigjoint:

I figured it out. I upgraded to a digital ballast and it's right next to the meter. It has to be electromagnetic interferance. All the symptoms are the same as well: PH and PPM levels are jumping around constantly

PPMs are almost too high, my plants got a little stunted but we're sitting around 800-900ppm now. Scratching my head because my PPM meter was getting thrown off as well. I have a digital ballast maybe 3 feet away, could this be it? but this wasnt happening on my last run...however I did...

For some reason when I started my new grow in a 5 gallon sterillite container I can't get accurate electronic PH readings. I even purchased a brand new probe and the water is reading between 8 to 25 and the meter is jumping all over the place. When I test by hand it's PHing very nicely in that...

Wow. I was not expecting 50% efficiency! This is exciting.

Yep, I'm wet.

Im trying to figure out if my heatsink can dissipate enough heat from my cobs.. CitiCalc says I have 72 "heat watts" by running 12 citizens @ 1050ma. So here are the calculations from my bar. Can someone enlighten my how much wattage I need to dissipate? Is it total wattage at the wall or...

Haha if you couldn't tell, I went out and bought those heatsinks.. Oh well, I'll definitely use these sinks when better SMD size tech comes out, or something of the like.

You think I could still use it and weld it into a liquid cooled setup?

I may have lucked out...?! I have the opportunity to snag 7x 36" long by 4" wide heatsinks (3/8 thick overall and the baseplate is 5/16 thick) on craigslist for $100... :clap: However I don't want to make a huge miscalculation here and blow a ton of dough My plan is to build a 2x4 vegging...