I switched to 8 100W equivalent LED bulbs from Cree. They were expensive, but they'll last forever. I recommend mixing spectrums. I went with 3 bright white, 3 soft white, and 2 of the warm. It seems to give the best mix. I've definitely noticed that the whiter the light, the faster you wake up in the morning, and the better everything feels.

I work in a home office though, and do have a window.

Its worth noting that GE now makes some fluorescent tube replacements with LED that have a much more complete spectrum. For those with Fluorescent fixtures above your desks, they will help improve the quality of the light you have. I've put them in my woodshop with great success.

Thanks for mentioning those GE tube replacements. I'm looking at a couple of fixtures right now.

Yeah - I'll be honest, a big reason I went for it was that they are MUCH less fragile. It used to be a fairly common occurrence that I'd hit a board into the fixtures on my ceiling. With the LEDs, I no longer get covered in broken glass a mercury powder. Instead, the bulb just flexes.

Probably also less susceptible to accelerated aging caused by on-off cycles.

What kind of lamp do you use to hold the lights?

standard track lighting that was installed in my rental house. Just a straight bulb swap.