The bright light protection might conceivably work by lowering the light level for the wearer, but I wear goggles constantly and haven't noticed anything. Then again I have several permalights on me too. --Frazyl 07:31, 15 March 2011 (UTC)
Feef says that his adventuring.perception bonus is lowered when wearing the goggles, but mine is not. Maybe because I can see the octarine? Further testing might reveal something. --Frazyl 07:31, 15 March 2011 (UTC)
While in the Snail I wasn't seeing some Nitsuni and figured out I now get a drop of adventuring.perception when wearing the goggles.
With level 402 it lowered the bonus from 375 down to 337 (-38) and while wearing bronze helm from 402 to 361 (-41).
Based only on these figures it's possible it removes 10% of your bonus, i.e. new bonus = floor(bonus * 0.9).
It's unclear why it wasn't doing that to me before. --Frazyl 08:33, 14 November 2011 (UTC)