Quote:
Originally Posted by Clifford Pope
Why does the unit need venting? Sealed beam units aren't vented  |
Because the bulbs are removable I suppose there's always a chance moisture could get in round the bulb flange, or maybe the seal between the glass & reflector isn't perfect. Sod's law says moisture will get in at those places but not out.
A sealed beam on the other hand is just one great big lightbulb.