The Helvar EL SC 2x54HFC now a Helvar EL 2x54sc is a dimmable high frequency ballast is to run 2 x 54w T5 and 2 x 55w 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.