That really depends how the balloon light covers are
taken care of. As far as direct weather exposure,
we had one customer who had MoonGlo Balloon Lights 24/7
for 54 months out on a temporary road on the San
Francisco Bay. High winds, cold fog and rain. They
didn't need new covers until the end of that period, and
then off to another job on the bay!
as we are happy to discuss.