this is due to the locking clip on bulb harness not fitting. some were made that had too thick of plastic in the area of the hole, and some were paper thin.
when mine was leaking it seemed like it was snuggly fitting and locking in but i guess it wasnt 100%. if its to thick you can dremel down some(if your crafty with it). this fixed my leak problem.
voyteks were to thin and he need to seal his.
i think this is the problem with most out there that claim to leak and never seem to find the problem. this is why when you fill them up with water there not leaking. water can get in,it just has a hard time getting out until the bulb heats up and it evaps.
there are a few companys that made aftermarket corner lights for are cars. ive seen 3 of them and there all a little dif.