i was there last Feb- it was great. It was actually too windy to go in a couple of days.
The light is different, the colors are more pastel. No, there are no lightbeams- but the contrast is less
and it was easy to get great images and colors.
And, no, even in Feb you will not be there by yourself. Upper Antelope was filled with foreign tourists.
Lower Antelope was less crowded- but certainly not empty.
Lower flooded this summer, and portions were closed as of a couple of months ago. I am not certain
of their present conditions.
Good luck with your wave application- I have had no luck so far