Did you spray the tops? Water droplets can act like tiny prisms and burn little spots like that into your leaves especially under a powerful flowering bulb.
Whatever the problem may be, I would remove any fan leaves that are as affected as those are and leave only the ones near and at the tops. At this point, its all about how much energy gets to your tops. Bad fan leaves like that are doing you no real good anyway.
Check your plant closely for a week. If the problem hasn't lessened or vanished within that time, it could be a nutrient problem and your plant may need to be flushed.