I'd get a ruling from your local electrical inspector on that one.
I'm not certain what the NEC says about permanently installed electrical fixtures near spas. I do know that there must be a 10' distance between your spa and any power outlets. I'm pretty sure the distance wouldn't be based on the 5' rule that applies to your disconnect, which is or should be to code for weather resistance.
One or several 115v lite bulb/fixtures would be ruled to a different standard.
Call the person who enforces the electrical code in your area to answer that one.