I went right off series connection because of the high voltages involved. At one point i built a large series connected COB rig but the 300V working voltage put me right off so it got turned into two smaller rigs.
I went with parallel strips after that, usually 24V. Circulation fans are 12V. No high voltage inside a grow space 
It’s a small but dangerous risk.
The manufacturers have no issue with it but they tend to do better wire management than we do. 
Covering the unused pads and wire connections mitigates that issue.
Cheers
G
In the OPs case he shouldn’t be much over 100V with that rig but if anyone wants to build larger rigs from those strips I recommend using a mix of series and parallel connection so you can then use something like an HLG-240H-24 or HLG-320H-36 to power the lot at a higher current but lower voltage. Oh and double insulate every connection. The heat and UV from these things can make wiring insulation brittle after only about a year or so of constant use. I use teflon insulated wire to get around that problem 
Silver plated Teflon wire… I love working with that stuff!
A bit more work to strip… but worth it.
Cheers
G
The removed teflon leaves a film behind that makes it nasty to solder but I find perseverance works. And shrink wrap to neatly hide the burnt bits 
In the end I chose to wire in series for simplicity and because with this build I do not exceed 140V (not that they are few), but if I had to do bigger builds I would definitely go in parallel
hide the evidence of the bad soldering 
I thought you was a sparky mate???
Lol I am but I’m talking about soldering teflon insulated wire. It’s…a bastard🤣 usually end up having to use so much heat you burn the end of the insulation. It is probably the best wire to use for a grow light though so worth the effort