Addendum -- Over the past several years, the variety of LED fixtures and bulbs has increased drastically and prices have dropped significantly due to increased demand, On the other hand, prices on incandescent bulbs have risen due to decreased demand.
For example, prices on my two tripod-mounted LED work-lights dropped roughly 20 percent in the 12 months between when I started looking at them and finally bought them. I haven't tried to run the figures but it's likely total long term LED cost is notably less than incandescent or fluorescent. (My gut feeling is total lifetime cost of LEDs is now 1/3-1/2 the cost of incandescents over the same period,)
Leean has mentioned replacing 4-foot fluorescent bulbs with LED equivalent bulbs. I plan to do likewise as soon as the bulbs I'm using and have on hand burn out. (Also, fluorescent bulbs take forever to warm up to full brightness in subzero temperatures ... hampering my ability to work on things throughout the year.)
