Why do my new HQI bulbs trip my GFCI (Somewhat urgent)

[cwatkins]

The outlets are GFCI, not the breaker.

The strange thing is the bulbs will light fine and work for a few days then trip the GFCI. And it doesn't trip at startup, it's always later on.

Like yesterday, it took a couple hours before it tripped.

My fixture is also grounded with a ground connection to the outlet. I may try swapping the bubs around today, but the thing is the Ballast (only 1 year old) is a Dual, and you cannot control each lamp individually. It's both or nothing.