GE Lighting 63517 Energy Smart CFL 3-way 16/25/32-Watt (150-watt replacement) 540/1440/1935-Lumen T3 Spiral Light Bulb with Medium Base, 6-Pack 50/100/150 watt replacement uses only 16/25/32-Watt 540/1440/1935 lumens providing fresh, energizing light Lasts 7.3 years based on 3 hours per day usage Estimated yearly energy costs $1.93/$3.01/$3.85 based on 3 hours per day $0.11 per kWh $103.00 in energy savings over the life of the bulb based on 3 hours per day usage