Looking for good, quick knot. (Tying lights to pergola with fishing line)

I have these "low profile" "fairy" noma led lights that I attach to my pergola in backyard. I want low profile so I use fishing line to attach to the cross beams. It's time to swap the line of 100 LEDs out because of course cheap Chinese LEDs only last 1 year. I'm not a fisherman.. but does anyone have a quick knot I can use to attach lights?