T8 Linear Fluorescent light bulbs operate on standard T8 preheat or instant start systems. For best results use these bulbs in conjunction with a properly rated ballast. For best results use bulbs on properly rated ballast. To help you find the right bulb for the right application, see Westinghouse full offering of T8 Linear Fluorescent light bulbs available in a variety of colors, sizes and wattages. For use with new or existing T8 ballasts in industrial, commercial and hospitality applications. These light bulbs contain mercury. Dispose of according to local, state or federal laws. Product reference number 07540.