Hi Marc,
How can you tell when a Metal-Halide lamp is nearing the end of it's life?.
Does the colour of the light change?, or can you tell by looking at the lamp?.
That's a very good point about using lamps that are not made for the particular mounting orientation(angle), I'd forgotten about this one, at least you know what you are talking about!.
That point about 24/7 operation, even in a Factory, the lights could be turned off during meal/smoko breaks, there are always ways around things like this.
Mike Trump.
