50/100/150. Indoor. 120V. Light output (lumens)/Energy used (watts): 460/50, 1170/100, 1630/150. Life: 1200 hours. Major filament. A21 Bulb. To save energy costs, find the bulb with the light output you need, then choose the one with the lowest watts. Unique sky-blue coating stimulates natural sunlight by filtering dull, yellowing rays. Even gray days feel sunny and bright when you use Sylvania Daylight. See, feel, the difference. Made in USA.