Compact fluroscent lamps (CFLs) have become popular in recent years, but do they make financial sense? Suppose a typical 60-watt incandescent light bulb costs $.50 and lasts 1,000 hours. A 15-watt CFL provides the same light, costs $3.50 and lasts 12,000 hours. A Kilowatt-hour of electricity costs $.101, which is about national average. If you require a 10% return and use a light fixture 500 hours per year, which is the better choice and why?