(2) 4 FT light bars with Full definition (greater than 80 CRI); Designed for 1 Upgrade Kit; Mounting: Existing linear fluorescent fixtures; Lightweight aluminum heat sink housing provides strength and durability; Durable plastic mounting clips with integrated magnets allow for simple snap on design to fixture; Total harmonic distortion: Less than 20 PCT; Suitable for damp locations; Designed for Indoor use; Lifetime: Designed to last 50000 HR