I have never used, have not even seen, the thing you describe. Might it work? I don't know.
I do know that this fixture is plainly made to fit on a standard box - and it also plainly has the wires going somewhere besides the box. Hence, there's no way this can be installed with the connections IN the box, as the NEC requires.
I suppose you can 'field engineer' anything; maybe I'll slip a milk jug over my keyless and call it 'raintight.'
UL's evaluations test the things 'as installed.' Or, they're supposed to.
OK, entering "Rant mode"
Apart from the specific challenges posed by this fixture ... look to the title of this thread. How often have we heard inspectors tell us "if there's no UL sticker I won't pass it?' Or, they defer any judgement as to whether something is code-compliant to simply looking for the UL tag?
IMO, the presence of the UL tag is nothing more than a convenience, and in no way is it a substitute for the AHJ making their own evaluation. The inspector far too often lets himself remain happily ignorant, passing the buck to UL. UL is NOT the AHJ, and it is (IMO) negligent for the inspector to do that.
My proof? Well, here's one product that slipped through.
The opposite is also true. I've seen an increasing prevalence of the attitude "if it's not made in a factory it can't possibly be allowed." This attitude has begun entering the code in more recent cycles ... here are some instances where a 'field assembly' has been debated:
- Shop-made extension cords, including those with simple cord caps;
- Simply replacing the plug on a cord with a different type (ie: twist-lock);
- Any sort of multi-outlet assembly;
- Simply using a threaded coupling to combine fittings for a transition between wiring methods; and,
- "Traditional" methods for hanging ceiling fans.
Some of these matters have made it into code language. Others are the target with an extroadinary application of the 'listing and labling' clause.
Folks sometimes insist on a listed product, where there is no such code requirement (Romex staples are an example)
Others seem to think that just because something is factory-made there is now a rule that says you can't do it yourself. (Twist-lock to straight adaptors).
The "UL Question Corner" more often has UL stepping beyond it's place and offering "official" opinions on matters beyond their jurisdiction. No one has ever elected UL, or given them any governing authority. They are not subject to the same checks, balances, or limitations as government.
Yet, there are hordes of folks out there who would accept the light fixture I posted simply because it has the UL sticker. Gee, the proplem can't possibly be with the fixture?
Had I mounted a keyless on a Bell box, and run an exposed tail of Romex to it, someone would cry: "that's not a listed luminaire as the NEC requires." Maybe not- but you'll never convince me that this listed fixture, with the individual wires either flying through the air or pinched between the box and the fixture, is 'safer.'