The Westinghouse 50/100/150 Watt A21 3-Way Halogen Light Bulb allows you to choose from 3 levels of light. Multi-purpose 3-way bulbs function well for ambient lighting general and task lighting applications. This warm white finish A21 bulb provides brilliant illumination perfect for table and floor lamps with 3-way sockets. Westinghouse is a trusted global brand. Westinghouse knows lighting and offers products with exceptional quality reliability and functionality. Product reference number 03259.