It seems like it would only work out for shade loving crops in areas where net metering is an option.

Have the panels mostly cover the crops in the day time (improve yields) and export to the grid (reduce or eliminate electricity costs), then turn on LEDs for some portion of the night (improve yields) and import enough to offset your exports (use any excess you have from the day time).

In those situations, the additional cost could be zero or even a net benefit with some increase in crop yield.