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      08-29-2010, 06:07 AM   #16
Bimmer-Bob's Avatar

Drives: 2010 128i
Join Date: Feb 2010
Location: Anacortes, WA

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The Xenons utilize the same bulb for high and low beams...the inner bulb has the corona ring for DRL and I think lights up for corner illumination (at least on my 128i). I think the dual lenses are pretty much to maintain consistency across the model range (as I believe they are more functional on the halogen-equipped cars, which require separate bulbs for high or low beams). The issue, however, shouldn't have anything to do with the number of functional bulbs - the xenons with one bulb are still much brighter than the halogens with two. In other words - if you have xenons, you don't NEED two functional bulbs - so who cares?