I would nearly call this one “easy”, as I never got stuck. I like the way you have to consider once the bulbs, once the loop… and once both in the same time. Nothing tough, but some interesting deductions to make.
I couldn’t say for sure, but I wouldn’t expect it to be that much different from the challenges of making a large instance of any Yajilin-esque puzzle (i.e. having directional clues), when compared to making a small one. Then again, as I suggested above, making one of these at any size is a true pain in the ass, so making a large one would definitely not be a cakewalk.
As for how to make one of these at all, I don’t think I could really tell you. My methods involved a ton of restarting and a substantial time investment.