I can help you with your floor plan if you like. I have a bit of experience designing grow rooms.
I suggest building the rooms large to the final size but only lighting a small section and adding lights and air conditioners as you get dialed in. I read earlier in the thread you aren't worried...
The 500PPM in your tap water will likely be full of calcium either way. 38ppm starting water is great. Will be 100% fine growing with it. Just to give you a reference value Ive been growing for years at 350PPM starting water PPMs with ALOT of that being calcium.
I personally have a lot of experience with these strips. You don't need a heat sink at 0.7a with them. The baking trays will be a perfectly sufficient heat sink/ physical support structure.
Some drivers might make 56V exactly, others might make 57, 57.5, 56.5 58, 60 even. But every driver will vary. Meanwell is sort of known for always having a little extra.
yes the advantage of parallel is it's easier to add more boards later on. But typically the lower the voltage the lower the efficiency, everything is a compromise. But parallel wiring for QBs is really nice and easy.
For wiring in parallel I would use the XLG240 H because it puts out 56V but that might be tight for a QB648
Also keep in mind the QB 648 can be ruined if you power them backwards (negative on strip to positive on driver and viceversa)
for wiring in searies the XLG240 M will be perfect...
You want 16 lights ~ 800W each.
And will probably expend another 1000-2000W on fans for air circulation and other grow room power devices like dehu,
That gives you around 14-15000W you need to dissipate heat from. Hopefully your noon has a minimum of 50,000BTU cooling capacity. A little more...
I know I know. I was only kidding around, sort of.
Is there any reference chart for amperage vs efficiency? Let me price out how much to do a 4x4 with decent efficacy and maybe I'll treat myself to Christmas gift as well.
It's from lack of food I think. You waited 2 weeks almost before feeding. I think if you feed and PH correctly they should bounce back.
I used to never feed seedlings for the first couple weeks which was never a problem in pro mix. But I noticed when switching to coco they need food almost...
Definitely cheaper ways to do. But this Can measure every single enviro input in one device and give you back the value as needed. I am sure there is a cheaper way with all sonoff or zigbee devices.
https://community.pulsegrow.com/t/api-and-home-assistant-config/1085/7
Setup home assistant based on the pulse grow data measurements like humidity. Then you use any home assistant compatible relay to send 24V to the quest and dimming signal to the LEDs