T12 Linear Fluorescent light bulbs operate on standard T12 preheat or rapid start systems. For best results use these bulbs in conjunction with a properly rated ballast. To help you find the right bulb for the right application, see Westinghouse full offering of T12 Linear Fluorescent light bulbs available in a variety of colors, lengths and wattages. These lamps are also available in energy saver, reduced mercury and high output varieties. They can be used with new or existing T12 ballasts in industrial, commercial and hospitality applications. These light bulbs contain mercury. Dispose of according to local, state or federal laws. Product reference number 07910.