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Series circuitry has the same current throughout. Both boards would be receiving the same amount of current (2100ma) and the wattage is what you will change to get your desired light intensity. In parallel wiring the total amperage is divided among the number of (+,-) "circuits" you have going...

Yeah I don't think it is the light either. I would guess you are over fertilizing. More information is required

HLG supplies resistors for the external POT. Since A drivers are built in no need for the resistor there. You can use it on another project

This is a tutorial from @ledgardener. Check out his stuff, lots of good content on his page

Ah yes female crimp connectors. Those are a good option if you mount the pot in a junction box. If they are moving around a lot those will eventually come loose. I would hate to have my light cycle get messed up due to a loose connection.

Damn should have put disclaimer in. I have never used them, but they do look rather cheap.

https://www.rapidled.com/cased-potentiometer-with-knob/ If you don't want to solder your pot

@pop22 and @420Barista probably just solved your problem. make sure your timer is rated properly. I have mechanical timers that can handle loads up to 40 amps on 240/77. https://www.amazon.com/dp/B00MWHQZX0?ref=emc_b_5_i This may be a good fix for you, 8 plug power surge with mechanical...

So there could be many different things going on. do you have a multimeter? I would have to guess that the circuit shorted out, recheck all connections and look to see if your wires on the circuit have exposed wire. This is where the meter comes in handy if there is exposed wire then a...

I trailed the driver on full blast. got readings of 176 F (~80 C). Yes they get hot, but they have ratings. I believe meanwell data sheets say 90 C is what the case can handle. However if you run them harder they will not last as long.

Yeah if you like IR and other non-photosynthetic spectrums. Not saying they are all bad. But I personally like not having those from my light source and supplementing targeted spectrums that are known to have beneficial effects

there are two positive and two negative connectors on one board. you can use them in a configuration most appropriate for your build, and no it does not matter which one you use. You can't damage the driver or the board from an improper wiring in series, If the circuit is not complete the boards...

Yes the rapid led pot will work. And there is an advantage to having separate dimmers on each driver, you can control how many watts are going through a specific driver. where as if you hooked up both to one pot they would keep the same wattage. I have three 2 board sets-ups running on the same...

Keep a set of four and run them in the corners. You won't see huge differences changing engines from COB to QB, if you go watt for watt. So if you are gonna change over you should keep the same wattage draw. But the points on less weight and lower profile are good reasons to switch

Most household circuits don't sustain loads like running lighting for 12-18 hours per day. While 14 will work it just makes sense to up the gauge to keep the wire temps down and give easy of mind knowing your shit won't melt.

as long as the connector is rated to handle the load. AC side needs a ground so you need to get a 3 pin

You can wire two drivers together in a junction box like @The Loafter said. Just remember you can only put 1800 watts of power on a 15 amp circuit, or 2400 on a 20 amp circuit. The two drivers together would use ~650 watts

3-5 bucks will get you smaller awg wires but they cannot carry heavy/constant loads. 8-12 bucks for 14-12 awg cord, go 12 awg. You can buy cable and put your own plugs on them for a good price, but you pay for a lot of cable that you are not going to use right away. Super nice to be able to put...

Pop wants to run the boards full bore with a light mover. that way the center of the space doesn't get a full photon blast at all times

Thank you sir, The 'wagos' are actually junction boxes made for wagos, but yeah they are big (it is the smaller of two models as well). I used 2 wire and I wanted to be able to quick disconnect the fixture and remove it so that foliar spraying would be simple. And I don't have the fixture...