First one was fitted in August 2017 and the sixth (yes 6th!!!!) replacement is on the way to me as I type. Now my mains is not excessively high varying usually between 235 to 240 (I log it on my UPS). Now admittedly I have some equipment with large motors, but not on the same circuit or feed from the dis board, but I DO have three of the non PIR version of the same 100 watt LED flood light inside the tractor shed fitted also August 2017, and so far non have failed.
There is no sign of water ingress on the failed units, but TLC can give me no feedback from the manufacturer as to the failure mode. Before I re-fit the latest one, which involves a very long ladder over a vast chasm of a door, I wonder if fitting some sort of surge suppressor 'just in case' might be sensible?
Has anyone any experience of such failures or mains surge suppressors in general? A quick peek at RS components show that they can be pretty spendy :(