Philips Ultra Efficient bulbs deliver up to 50,000 hours of light, more than 3x lifetime usage as compared to standard LED 15,000 hours bulbs with a lifespan of 45.7 years (based on 3 hours/day). Our most energy efficient bulb promotes lower energy bills, reduced carbon emissions, and a more sustainable footprint for the planet. With their familiar shape and standard E26 screw base, Philips Ultra Efficient 100-watt A21 clear filament soft white light bulb fit in many standard household light fixtures, including table lamps, hanging lamps, sconces, ceiling lights, and more. They’re a perfect replacement for traditional incandescent bulbs. Instantly save 40% in energy by replacing your standard LED bulb or existing incandescent bulbs with this energy-efficient LED bulb with an estimated energy cost per year of $1.03.