SY-B7 : (ELCTRONIC BALLAST) 1. 17.7*2.9*2.5cm N.W, : 0.075KG 2. FIT FOR 110V 60HZ ,220V 50HZ 3. FOR T-8 AND T-12 LAMP 18/20w 36/40w 4. POWER FACTOR >=0.95 5. HIGHEST TEMPERATURE :80 C 6. NORMAL TEMPERATURE :0---50C 7. 20 PIECES FOR A CARTON 7. CARTON PCKING :220*160*130MM SY-B6 : 1. 11.5*4*2.6cm N.W, : 0.31KG 2. FIT FOR 110V 60HZ 0.28A 3. FOR T-8 AND T-12 LAMP 18/20w 4. 20PIECES FOR A CARTON 5. CARTON PCKING : 225*135*130MM SY-B5 (close ballast) Voltage: 220 V-240V 50 HZ or 110v 60 HZ or 120v-270v POWER FACTOR:> 0.95 THD: 25% MEUS: 23.8*6.1*3.8 CM Material : steel cover suit for high temperature Used for 2 lamps , for fluorescent lamp T8-T12 ,32 w ,34w,35w