Reef Tank Metal Halide Bulbs

how can i tell if the ballast or the bulb needs to be replaced on my metal halide Reef Tank light?
the bulb has what look like small metal shavings on the bottom and one can look directly at the bulb.
It sounds like the bulb to me. For best results get the bulb made by the same manufacturer of the light.
Reef Tank with 175 watt metal halides 15 K
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