GE Lighting 97785 50/150RVL, 3-Way, Pack of 12 A21 shape with medium base for use in table lamps and enclosed fixtures Lasts 1.1 years based on 3 hours per day usage Estimated yearly energy costs $6.02/$12.05/$18.07 based on 3 hours per day $0.11 per kWh. Lamp type: Incandescent, A-line Bulb: A21