The Osram QTP5 2x24-39/230-240 is a non dimmable high frequency ballast to run: 2x 24w & 39w T5 and 2x 30w T8 lamps. 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.