During this week we have been sent to replace a number of 250watt Metal Halide lamps,
Upon arriving we are confronted by an irate customer shouting that the `darn lights keep exploding`
we go into the factory and as we walk through the buiding a large bang was heard behind us and that area went dark, a bit scary.
We get up on the services area above the main factory floor to look at these lamps and they have litterally exploded within there envelope,

Having never come across this i am curious as to why ? has anyone got any ideas.?

John H