Combine a classic filament look with advanced LED technology with the Feit Electric 40-watt equivalent T10 LED light bulb. This dimmable 2700K Soft White produces a similar light output 400 lumens using just 4.5 watts - up to 89% less energy than an equivalent incandescent. Feit Electric LED Filament series T10-shaped light bulbs have an average life of 15,000 hours/13.7 years are RoHS compliant, and are 100% mercury free.