I have a dealer friend who sets small polished stones in the Wellspring just to make it look a little less formal. they stay there all the time, just a small cluster of them, and they make the water flow more like a little stream.
I hadn't thought of it till I saw your post, but I bet something like that would help keep the light out of your eyes.
Otherwise you could just unplug the thing - I don't remember just now, but I think that it plugs into the IQ-2020 board. Turn the power off to the spa before you open the thing, of course.
If you want more info on that let me know and I'll get the specs out and find out exactly how to kill the light.