My energy saving light is still going after six years.
I replaced traditional, incandescent bulbs with the energy saving, spiral ones. This includes all sixty two lights located inside, outside, garage and closets. Light bulbs in microwave, stove and refrigerator were not replaced because the energy saving lights are not recommended for extreme cold or hot environment. The smallest bulbs and the ones mounted upside down have the highest failure rate. Largest bulbs are lasting the longest.