Originally Posted by
ARider2
Can you comment on whether the Decathelon light is suitable in a rainy environment, is it water resistant or water proof?
I've used them years ago, both as tail and headlights. Withstood crappy weather. The black rubber envelope semi-loosely wraps around the electronics -- I wouldn't use these as diving lights

(perhaps use some weak glue to seal the envelope?)
Perhaps purchase a few and test in the shower, and then bath. I'll read your report with considerable interest