SATCO NUVO'S Type B Ballast Bypass lamps are designed to replace T8 or T12 medium bi-pin fluorescent lamps. Engineered for single or double-ended wiring options, these lamps will not light unless the ballast is bypassed. Choose from 3000K, 3500K, 4000K, 5000K, and 6500K color temperatures with CCT selection at installation. Available in two, three, and four-foot lengths for immediate energy savings in a variety of commercial and industrial applications.