Good morning, John;
BenjiBoy may have something there. I use four (4) 60 CT-1 flash units for portrait photography. I have noticed that all of the sittings in recent times have been done with the people insisting that, yes, they normally do wear high altitude glacier type sun glasses.
"News Flash!" In looking through the manual, I do see that there is a way to have the internal electronics cut the power back by five (5) stops. This might even help with the number of people asking me why I am testing low yield thermo-unclear devices while taking photographs.