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My concern is with the usage of blade style fuses in high voltage applications. The fuse holders you showed are generally rated for 12 volt systems and have a voltage max of 32 volts. The ac side is either 110 volts or higher and the cobs in series is even higher voltage.

What is the max amperage rating on the cobs you are using? That is the fuse amperage I would use to protect the dc side. Anything with a higher amp rating will only save the house.

Fusing the dc side at 5 amps is not going to save the cob. The max amperage the 36v crees are rated for is 3 amps I believe. Make sure the fuses are rated for the voltage you intend to run them at.

The less efficient the light the more heat it can generate. I would go for a mix of cfl and led screw-in bulbs. Cfl for heat and a little light and led for directional light intensity. Using multiple sockets you could easily change how many watts you are running and dial it in.

It will be easier to keep autos warm because you can run the light 24 hours a day. An adjustable fan would make it easy to keep airflow low and not exchange all your heat outside the grow area. If your airflow is to low you may have issues with mold or low co2. Use internal fans to push hot air...

It's a small ngb box with a separate vegging area

Yes, cobs leds have a great spectrum that matches up close to the McCree Curve (what plants crave) I use 3000k crees myself for flowering but you can use 3500k - 4000k for veg and flower. You can add reds in down the road if you think you need them. Starting out in a 4x4 I would go with 8 cobs...

Yes, I was using Fox farm big bloom at the time. I've since moved on to organic soil and blumats. I had a thread in the micro section on icmag that followed the process. https://www.icmag.com/ic/showthread.php?t=138436

Are you wanting a variety of strains? The reason most people run multiple plants is to cut down on veg time. It would take no time at all to fill a screen in an area that small. Trying to keep six plants that small can be done but it will be harder than just one plant spread out. Sometimes I...

1 - it's overpriced and not really 700w. Go spend some time in the led section and learn about cob leds. Blurple grow lights run hotter than cobs and don't have all the spectrum that plants crave. White leds are growing some unbelievable buds now and for the same price you could pick out the...

I was using small amounts of nutes straight into the tank with the fish. Couldn't be any worse for them than farm run off imo

It takes a couple runs to get the aquaponics established and performing. Pulling up a seat with some experience if you need help

Just keep a fan moving air in the flowering area. Stagnant air is worse than higher humidity

Add everclear

Lol

Sorry, I was addressing the OP. Do you have a thread?

I personally mounted the heatsink fins outside my cabinet and the cobs inside through the ceiling. My drivers are mounted outside as well

Passive cooling helps keep the heat up at the top of the tent instead of stirring it around. In conjunction with a heat extraction fan placed at the top it could possibly be more efficient at removing the heat.

Can you mount the driver outside the tent? This would help remove some of the heat

Toss a cfl or incandescent bulb in for some cheap easy heat during lights on. Maybe you could spray paint them black if you need heat during lights off. Don't worry to much about efficiency, decreased yeild would be a bigger loss.