100,000 Hours Rated Lifespan. 10 Year Warranty. L70 > 53,000 Hours (In 2×4 Lensed Troffers). Does Not Use Existing Tombstones. Flat Back Magnet Fit With Screw Mounts. Quick Connects Between Driver and Tubes. 14" Leads From Tubes and 6" Leads From Driver. ETL Safety Certified – Conforms to UL Standard 1598c. DLC Standard – Linear Retrofit Kit for 2×4. Saves About 50% Energy O.