The philips hf p 1 14 35 tl5 is a fixed output high frequenct ballast for use with 1 x 14w 21w 28w or 35w flourescent lamps this ballast has a flicker free warm start electrode heating cut off low energy consumption and automatic stop circuit stop start the philips hf p is often used in department stores airports railway stations hotels and hospitals it is also suitable for emergency installations