T8 lamps used with electronic ballasts will typically use about 32% less energy than the same lumenaires with T12 and magnetic ballasts. T5 lamps and electronic ballasts will use about 45% less energy than the T12 setup. Additional savings are possible if a lighting re-design indicates the use of reflectors and delamping, or fewer lumenaires. “ECO” T8s also use little or no mercury inside the lamp, saving on disposal and environmental costs. Longer lamp life and less lumen depreciation means lower maintenance costs. Worker productivity increases with light quality improvements.

(Source: National Lighting Product Information Program)