I’ll try to get you steered in the right direction.
Hydroponics requires a few things to be successful:
First: water temps need to be below 70F. This is to prevent root rot and to increase dissolved O in water.
You would be better off to run high purity water: R/O system for example. The reason is that in hydroponics you add salts to solution to a specific PPM i.e. 750 ppm. If you start with water that is alreayd 500 ppm (like I have), you can only add salts to bring up to 750 which means less nutrients for the plant. If you start with pure water, ALL of the contents are directed to plant.
If you don’t already, you need a good TDS and PH meter: not one of those 3 in 1 meters but a good digital device you can calibrate. Strips and drops do not give best accuracy for cannabis.
In general if you are using China lights then yes for coverage.
The metric for blurple lights is 50 watts per square foot, from the wall. Not what the manufacturer tells you (likely they are lying).
Complete waste of money. They don’t generate anything like enough CO2 and they are stinky and messy. You need a sealed system with full environmental controls, lighting WAY beyond what you have now and HIGH partial pressures of CO2 (think tank and regulator).
Doesn’t really help: plants also do not absorb photons from the bottoms of leaves; just the top.
Need to know the square footage of your space to tell you.
Bucket hydro without a rez is a mistake due to the lack of space in the buckets. If doing DWC you will be mixing nutes and refilling buckets daily: a huge PITA. Adding a standing rez allows a larger nutrient solution which maintains PH and TDS more stable than without. Huge PH swings occur in late flower with bucket hydro. If doing this type grow, a yellow top tote of 27 gallon would do a much better job.
You really should look at decent lights (Horticulture Lighting Group is the leader in lighting and at least should give you ideas) and you really need a chiller.
This is perhaps the best thread on the forum: you may want to do a diy light build: I did.
More light beyond a certain point doesn’t help: it’s mostly wasted. Having correct amount of light is key.
Look up terms like: Daily Light Interval, Vapor Pressure Deficit, and for nutrients look at “Jack’s 3-2-1”.