The Osram QTP5 2 x 14-35/230-240 is a non dimmable high frequency ballast to run: 2 x 14w, 21w, 28w, 35w T5 Fluorescent Tube and 2 x 28w Compact Fluorescent. These ballasts have an average lifetime of 100,000 hours They offer flicker free light, have an automatic safety shutdown at lamp failure, automatic restart after lamp replacement and are suitable for emergency lighting.