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Mercury vapor is no longer made, and uses more power for the same light, but the bulb will last longer. MH lamps have an igniter that can fail. The smaller bulbs only last about 10-12,000 hours while mercury can easily go for 24,000 hours plus. Also the light output color:

Coated MV is a warm pink / white cream color

Clear MV is sharp green/blue

MH is white to warm white.
 
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