Functional, trusted and highly-efficient High Output Dimmable High Frequency Ballast from Huco for Twin 39 watt T5 (16mm diameter) Fluorescent Lamps. Ensuring not only smooth, flicker free operation but over-voltage protection, end of life shut down and 1-100% dimming. This gear guarantees a 50,000 hour service life and reduces energy consumption by 60% compared to a conventional ballast. . Typically these ballasts are used in office, retail and commercial applications.