Same when I worked at Rackspace. I was in a football-field-size windows-less room (there were actual windows at the periphery but I was so far away it didn't matter) right under a fluorescent light fixture shining right in my eyes. Most of us had these gigantic plastic leaf shades we found in the kids section of Ikea blocking the light. Some folks went as far to drape their cube in surplus camo netting.
Now I'm in an office sitting right next to a 10x10-foot east facing window with lots of light and views outside. But I nearly always have the shade down since the sun shines right in and blinds me every morning.
All this could be solved with private offices. I just hope I live to see the day when our line of work reverts back to private offices from this open space insanity.