I’m basically a cubicle jockey too. I try to spend my entire 1hr lunch break outside at solar noon for UVA+UVB. At my desk, I use an overhead lamp with a 2100K 40W incandescent to add Red+IR frequencies to help balance the blue dominance of the office fluorescents.

Ideally I should find a higher wattage lamp and a reptile or heat bulb with UV. My vision is something like an architect lamp like this: