ThinkLites LED Retrofit Kit is the most efficient alternative to ALL types of linear fluorescent fixtures, including those with T12, T8, and T5 lamps. With an industry leading efficacy of 180 Lumens per watt, this solution can easily maintain or increase light levels while saving 70% in energy consumption. The simple design ensures the quickest installation time in the industry and includes a unique feature that ensures a fluorescent lamp cannot be re-inserted back into the same fixture; commonly referred to as snap back.