I used syska led in 2 yers I believe it most because I used it most I can see the cange in my husousing bill I can the the big difference in my electricity bill I see that in past my bill is come in between 1500 to 2000but before I used syska led bulb my bill come betwewn 1000 to 1200 I used syska led and also advice enyone to use this