The Helvar EL SC 1x35HFC now a Helvar EL1x35sc is a dimmable high frequency ballast is to run 1 x 35w T5 1 x 36w 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.