How large should the LED-strip driver and feed plan be?
Start with the exact data-sheet W/m and maximum single-run length. Check driver capacity and feeder-pair voltage drop separately; add feed zones whenever the manufacturer run limit is exceeded.
Method
Load = length × W/m × utilization. Current = load ÷ voltage. Feeder drop = current × two-way conductor resistance. Feed zones = round up length ÷ manufacturer maximum single run.
Important limitation
The feeder calculation does not model proprietary copper traces inside the strip. Cable ampacity, fuse protection, mains wiring and statutory compliance need the exact product documents and a qualified electrician.