"GE says the new bulb uses just 9 watts and provides a 77% energy savings
while lasting 25 times as long as the 40-watt bulb it's intended to
replace."

http://www.foxnews.com/scitech/2010/...b-lasts-years/

Assume a 40-watt bulb lasts 1000 hours.

40w x 1000 = 40 kwh x $0.15/kwh = $6.00 operating cost over life of bulb.

The new bulb uses 9 watts. So for the same period,

9w x 1000 = 9 kwh x $0.15/kwh = $1.35 operating cost.