Medium base. A21 bulb. Last 1.6 years. Use high wattage for reading or task lighting needs. Use medium wattage for general lighting. Use low wattage for energy savings. www.philips.com/lighting. Questions or comments: 1-800-555-0050 or www.philips.com/lighting. Made in China. Brightness Quantity: 270 lumens; 845 lumens; 1110 lumens. Energy Info: $3.61; $8.43; $12.05 based on 3 hrs/day, 11 cents/kWh. 30 watts; 70 watts; 100 watts. Package Info: 1. Voltage: 120 volts. Bulb Info: Is Three Way. Screw. Medium. Bulb Life: 1.6 years based on 3 hrs/day. Bulb Appearance: 2800 k.