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I'd change your method, because 50% is a poor success rate. If you are worried then just pop 5 or 6 in a propagator using a different method. I'm playing with an aeroponics cloner at the moment , bit my usual method is a seed tray filled with perlite alsat in an inch of water, of try root riot...

I have set up several like that

It's fine, keep em both on all the time. Ideally the Y will be bigger at the outlet like 6"-6" - 8" But to be honest these ducts and fixtures can usually handle way more than we are pushing through them

I've only ran autopots,not octo, but I think it's the same principle . Autopots recommended around 1.2EC I think. But on the other hand some nutrient manufacturers suggest way more than others in general. If you see a large amount of salt build up on the top you'll know it's OTT

I think 90% if not more of all grow lights are manufactured in China. Much like every other tech.. Ranging from cheapest crap in the world to some of the best.

The key is it doesn't dry out so salt build up is minimised . Also it's typical of a system like that, like autopots, that you run low EC nutrients to avoid it.

@Delps8 "Was't Timber still selling blurple or white LED's in big box enclosures with fans? If that's the case, they were just wringing out the last few cents from their trade name." i believe timber started at the same time as northern grow lights , northern grow lights later joined with I...

The second one, you couldnt even buy two xlg drivers on their own for that price. The first one, same , doubt it's a meanwell driver. By all means spend $30 and test it, but I doubt anything on the advert is factual for those prices

Can you post a link

What nutrients are you using? What's your res temp? Why is it all blue in there? What's your grow room temp?

https://growlightsaustralia.com/product/buddies-plug-and-play-kits/

Grow light Australia do some things called buddies. You could wire a small driver into your existing wire and then they have stick on pads , you could put string/s of them spread out under the 4ft space

Yeah, if it's off the chart it would suggest a long slow accumulation.. Which is why it hits mid flower. I'm a coco guy so can't give you the quantities and timings for soil unfortunately.

Going off your previous issues, when you start feeding, I'd start at lower dose, increase slowly .

EC is always the same scale, where ppm has different scales, so if someone says ppm we have to ask on which scale.

What's your EC of your nutrients?

If you've made changes , I'd see how things go. The last one you can see tip burn, and it looks heavy on N , though photos can be deceptive, so it might be a case of just reducing your overall nutrients to avoid the same pitfalls.

Well apart from having it independently tested , the best bet might be going full RO and adding back your calmag