How much stimulus money does it take to screw in a compact fluorescent light bulb?

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Apparently $109.5 million. From the aforementioned 100 Days, 100 Projects report:

The New York State Veteran’s Home at St. Alban’s, in Jamaica, New York, is using $109.5 million in Recovery Act spending to install more efficient motors, variable speed drive units, lighting, ballasts, lighting sensors, daylight sensors and to replace incandescent bulbs with compact fluorescent bulbs. All of these improve the energy efficiency of the facility, lower costs, and lessen its impact on the environment.

Just curious — let’s say the improvements cut the facility’s power bills by half. How many years will it take for those savings to equal the cost of the $109.5 million spent to achieve those reductions?

Incidentally, these things look vaguely like earmarks to me (You sure it’s not a case of when you have a hammer, everything looks like a nail?-ed. Hey, we’ve got dollars, we’ve got recipients, we’ve got project descriptions — all we’re missing is addresses!).