Newbie question concerning "connecting" LED lights (maximum)

[jigeye]

I have a 2,000 square ft unfinished basement that I am adding lighting to. All of the basement will not require intense lighting so I am going to section it off on the areas where I need it. Here are the facts about what I bought/measurements, etc:
Bought:
[2] Barrina T5 LED shop light/8 ft/ 5000 LM/45W linkable. Pack of 10. [aka a total of 20 led strip lights]
Measurements:
Where strip lights are mounted in photo to floor: Roughly 9 feet.
Distance between strip lighting: 19 inches.
Other:
I understand the basic electric load calcs for a given amperage (80% rule, etc)
I am having a electrician come out and set up my "zones" and hardwire everything when I figure out my plan.
Q1:
Barrina manual states I can only "link" 5 LED strips at a time. Why? I assume and electrician can hook up all of the strips in a certain "workzone" as long as they meet the load requirements for the breaker, correct?
Q2:
The lights are strung 19 inches apart as per the floor joist. I am unsure "what" the optimum length "between" light strips is good whilst keeping the lighting in that particular area bright.
Q3:
Any other advice on how I am proceeding appreciated. It appears I am doing the right thing but I am new.

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[mm08822]

Q1) The internal wiring of the fixtures can only support the load of 5 fixtures. The 1st one sees the load of all 5 fixtures. It is a limitation established by the mfr. I would not exceed it as I'm sure doing so will cause some type of future failure.

The cb loading is different than the fixture pass through limitation. You can have many rows of 5 light strings where each 1st fixture in the row is fed from the branch circuit.

Q2) 19.2" is very tight! Consider every other joist or run 90 degrees to them at other spacing. You need to establish what "bright is" for your needs. Wall and floor finishes can impact the numbers, too. Playing around with the rows/spacing etc., before Sparky arrives is good to get that our the way so he can just wire, 1st time, one time, what it is you want.

Q3) Plug 'n play on your time is cheaper than on Sparky's time. Figure out which lights you want on different switches.

 

[jigeye]

thanks! good advice