Energy saving bulb. Energy star. Lasts up to 7 years. Electricity cost savings: kilowatt hour rate - 10 cents, 13 watt - $38; kilowatt hour rate - 12 cents, 13 watt - $45; kilowatt hour rate - 14 cents, 13 watt - $53; kilowatt hour rate - 16 cents, 13 watt - $60 (Energy cost savings based on 8,000 hour average life as compared to using a 100 watt 1000 hour bulb. C UL US listed. Based on normal household use of 3 hours per day, this bulb lasts up to 7 years. To save energy costs, find the bulbs with the light output you need, then choose the one with the lowest watts. Incandescent soft white bulb - 620 lumens, 60 watts, 1000 hours; mini twist - light output 800 lumens, energy used 13 watts, life 8000 hours. Quality satisfaction guaranteed. Made in China.