The Helvar EL SC 1x24HFC now a Helvar EL1x24sc is a dimmable high frequency ballast is to run 1 x 24w T5 and 1 x 24w PL-L fluoresent tube. They can be dimmed from 1-100%, extremeley low energy consumption, Flicerless light, Optimum cathode control and simultaneous lighting control by switch-control and analog control.