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Do you know that the old lamps are dead too? Have you tried them with the new ballasts? If you can prove that the old lamps still work, then it must be clear to the customer that the fittings are only dying because of the ballasts. If the lamps are dead too, then it's harder to identify which is the chicken and which the egg.
One common factor that would be implicated with a sudden mass failure of ballasts would be an overvoltage. I dimly recall a lot of fried electronic transformers for LV halogens that we traced to an intermittent neutral connection in a 3-phase DB, that had caused occasional overvoltages on one phase that fed mainly the lighting.
If you can get one of the old ballasts open and fancy posting some pics, we might be able to do forensics....
One common factor that would be implicated with a sudden mass failure of ballasts would be an overvoltage. I dimly recall a lot of fried electronic transformers for LV halogens that we traced to an intermittent neutral connection in a 3-phase DB, that had caused occasional overvoltages on one phase that fed mainly the lighting.
If you can get one of the old ballasts open and fancy posting some pics, we might be able to do forensics....