New style headlamps
On B Class vans, 2007 onwards, the running lights have a 21 watt bulb fitted. If you feel the head light after 1 hour running, you will notice that the glass is very hot, and is a possible cause for this type of headlight to shatter. I replaced the bulb with a 12 watt bulb. Which reduced the heat on the glass. The cost of a new bulb £2. A new head light costs £1,000.
Info from Stewart Mills.