Headlights

[NastyBlackx5]

After my ghetto installation, using glue from high school physics bridge projects LOL, i was pretty anal about making sure the plastic coverings were on securly and even resealed the glue.
Now that the weather is turning, i woke up to a drenched headlight. Im getting really scared that this could compromise the whole assembly. Will water kill my lights?
If so how long do i have?
and
What do i do to prevent it again?

Also on a side note, my ground cover wont close because of the lack of slack from the angel eye cable...any ideas on how to get around this without having to cut another hole into the covering?