This philips hf r 118 pl tc dimmable ballast runs a 1 x 18w pl c or1 x 18w pl t this ballasts lamp power can be regulated from 1 to 100 automatic stop start automatic restart after lamp replacement up to 75 reduction in energy consumption and quick programme flicker free startthe philips hd f ballasts are commonly used in offices these units are for use with installations with emergency back up