Preliminary results in, first unit out of the box examined, one of the round 10w.
Just the facts ma'am.
Initial impression of robust construction slightly let down by somewhat careless finishing. For example: whatever it's coated in, they did it after the fine threads for the holes were tapped. Noticed right away, trying to thread the bracket to lamp module together, tight as. Ran the allen screw in by itself with some spray lube as you would a tap: two turns in, one turn out/lather rinse repeat. OK, threads clean, goes in fine... this however led me to suspect the integrity of the other three fasteners, namely those holding the 'face' of the lamp onto the body. Not extremely surprised to find one of the three stripped and spinning freely in its bore. Removed the allen screw (and a pile o' aluminum dust), and stuck it back in there with some Loctite 242. Good enough.
Here we add a pic instead of typing a thousand words:
Clear that the width of this bracket is just over 1mm more than the fixture it is meant to embrace... suspect that this is why many internet reviewers stripped the threads/have trouble getting it to stay tight. Bracket is fairly robust and the bolt is not up to compressing against it to maintain tightness in the supplied configuration. Adding a washer between the mounting fixture and bracket removed the slop and allowed for sufficient tightening without distorting the bracket. An even better solution may be to use toothed washers internally on both sides. Don't have some that size kicking around right now it seems, to be explored later.
With the washer in there/fair and square mounting the factory supplied bolt is just a hair too short, will also be rectified. Should have a lock washer under the bolt head too so.
Will check out one of the 18w next...
