(6 Pack) Parmida LED T8 Hybrid Light Tube, 4FT, 18W (40W Replacement), Frosted Cover, Shatterproof Glass, 2200LM, Dual-End & Single-End Powered, Works with/Without Ballast, 4000K, UL & DLC INSTALL WITH OR WITHOUT A BALLAST. These tubes can be installed with a ballast (plug and play) or without a ballast (direct installation), with both a single and dual ended connection compatibility. 18W without ballast, 20W with a ballast. Please check Ballast compatibility before purchase. Standard international 4' T8 tube shape. KEEP ORIGINAL TOMBSTONES. This tube installs directly into your fixtures original shunted sockets (tombstones), meaning you will not need to retrofit your fixture with non-shunted sockets. This tube is UL-Listed for installation with a single and dual-ended connection. Fast, simple and secure installation under the functionality of your choice, this tube is designed with user experience as the defining motivator. CERTIFICATIONS: DLC-qualified which allows eligibility for state and nationwide rebate programs. UL-listed for optimal safety. Additional Certifications: FCC, IES SHATTERPROOF. This Parmida T8 is designed with a UL-listed frosted shatterproof film protected glass housing which allows for safe installation in fixtures, with or without wire guards. 5 YEAR UNLIMITED WARRANTY. Parmida LED Technologies' 5 year warranty provides you with ease of mind.