I would do what John T has suggested. I would first suspect a short between hot and safety ground in one of the fixtures or even in the switch box.
I would further suspect that your safety ground connection/breaker panel may not have a good ground connection to neutral in the system where it is supposed to be connected. If it does not and you have a ground rod connected to the breaker panel you could have extra current flowing thru the earth via the hot to safety ground short.
If the safety ground is properly bonded to neutral the breaker would trip if this was the problem.
I am assuming that the breaker serving this circuit is in a sub panel in the shop? How/where does this panel get its power?
If this is a sub panel it should be fed with 4 wires from the main panel where neutral and safety ground should be bonded.
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