probably a case of check how well the cover at the back fits afteryou've changed a bulb because this is the only real seal to an opening in the healight unit.
May be a case (on a warmish dryish day)of removing the headlight andusing a gentle hairdrier action to warm and dry the air inside the housing and then making sure the cover seals properly
May be a case (on a warmish dryish day)of removing the headlight andusing a gentle hairdrier action to warm and dry the air inside the housing and then making sure the cover seals properly