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I’ve been using those integrated flat LED fixtures in my place lately. I don’t find them too difficult to install, and at least one of my rooms has a rather low ceiling so I’d rather not have stuff dangling down where I can bonk myself on the head with it.
I haven’t had a single problem but if they die they’re trivially easy – for me – to replace. They’re just held onto the ceiling electrical box with two screws, and the electrical connection is two wire nuts. It’ll take me longer to find and lug my stepladder into position than it will for me to replace one. Light fixtures are dead easy, you don’t even have to find and turn off the breaker. Just turn it off at the switch before you mess with it.
The example you linked is suspiciously expensive. I’m getting these for around $15 each.
If you are going to go the socket-and-bulbs route for any of the reasons raised by the other comments here, make absolutely certain that you don’t get a fixture that is enclosed in any way. Enclosed fixtures will kill LED bulbs quickly, and in extreme cases you’ll go through them faster than filament bulbs.
PLA is a poor choice for this application. PLA will permanently deform under constant load (creep) even at room temperature. Hanging things on a hook is definitely a constant load – especially up to 45 pounds worth of something. These may not fail under short term static testing at that weight but I can tell you they absolutely will not withstand that type of load for an extended period. They’re probably fine for very light duty hanging, however. I have a variety of PLA pegs and hooks around the place that are at most holding a couple of ounces in some cases for 2+ years and they have not appreciably deformed, or at least not to the extent that I’ve noticed enough to care.
But to avoid the inevitable customer complaints of this ilk, I advise you to either lower your advertised load rating or print these out of ABS or ASA, or at the very least PETG if your machine can’t handle the higher temperatures required for ABS reliably. Polycarb would be even better but it is extremely difficult to print with consumer printers and is probably more trouble than it’s worth. Out of the “normal” non-exotic, non-super-high-temp filaments readily commercially available, ABS has the best creep resistance.