Medium base. A21 bulb. Last 1.6 years. Brightness: 420/2235/2655 lumens. Estimated Energy Cost: $6.02/$24.09/$30.11 per year. 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: 420 lumens; 2235 lumens; 2655 lumens. Energy Info: $6.02; $24.09; $30.11 based on 3 hrs/day, 11 cents/kWh. Cost depends on rates and use. 50 watts; 200 watts; 250 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.