No way are headlights sealed. Not only, as you say, is there effectively a gap where the bulbs and associated wiring goes in, there'll also be a drain hole somewhere.
If you're super confident, take the units out and completely seal them, including the drains. Then grease up the bulb or wiring grommets. See how that goes.
The monkey at vauxhall told me they are sealed ....
I didnt believe him, as there are clips that look like like they come away from the light housing.
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