The standard light bulb base is widely used in households. Compatible with both E26 and E27 lamp holders(not included).The standard light bulb base is widely used in households.Suitbale for 2"and 2.5",3"and 3.5"light holders(not included).Easy Installation.Fancy&Decorative CrystalNo Strobe or Flikcker.These led bulbs are not dimmable,please DO NOT connect it to dimmer switch.Energy Conservation.With a lifespan of 26000 hours,the bulb will serve you for over 9 years and only costs you $0.6/yr (based on 3 hours of use each day).Instant OnHigh CRI of 82,Light bulbs works down to -4°F.500 Lumens and 3000K Warm White light bulb creates soothing atmosphere for home,restaurant,hotel,etc.Comfortable light.Approved by the ETL/CE/FCC/RoHS. 5 years Warranty