Originally Posted by Illumicare
If it is wicking, it definitely would be, because the clay holds th moisture, the paper would sit in it longer, thus having more time to wick the moisture.
If it is purely atmospheric, soil type shouldn't matter, but humidity would. If you have a lot of condensation you might need to swap out gel packs after the first couple of days.
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Wicking may be an issue, but even IP68 (completely sealed) fixtures will have this condensation problem unless the atmosphere within the fixture was extremely low humidity when it was sealed. Sealed lamp mfgs. flush the air out with near zero humidity and certain gases. Sealed fixture mfgs. most likely don't do that.