Here is my reply from WAT
Good morning , this is normal and there is a drain hole for the moisture to eventually escape. If you wanted to you can take the lens off and wipe out the condensation as these assemblies were designed to have a removeable lens. The moisture will not effect the light...
I flew through some rain the other day and both my new WAT led wingtip lights had water in them. Has anyone else seen this.
I contacted WAT, they said to put sealant on them. I'm not impressed.
Shannon
My GTX 345 just failed with the "Transponder Failed No 1090ES TX" warning. It's on the way to Garmin for repair - just shy of 200 hrs and 3.5 years after install. My shop says Garmin will charge $1300 to fix.