Standard. Medium base A19. Provides light similar to natural daylight. Light Output: 400 lumens. Energy Used: 40 watts. Life: 1000 hours. Looking to bring out the colors in your home, but don't know how? Try changing your current light bulbs to Natural Light! Natural Light's distinctive blue coating reduces dull light effects to provide light that is more vibrant and natural. Ideal for table and floor lamps. Made in Indonesia.