Sylvania Substitube T8 Led 4' Replacement Bulb ▪Frosted Glass Tube ▪12 Watt ▪4100K ▪50000 Average Hour Life ▪2,100 Lumens ▪82 CRI ▪Operates On Instant Start And Select Programmed Rapid Start T8 Electronic Ballasts With 120-277V And 347V Input Voltage ▪Mfg #LED12T8L48FGDIM841SUBG9 ▪"Pkg Of 25"