Keystone Sign Hero LED retrofit lamps that replace T12 HO and T8 HO fluorescent sign lamps. Offered in single-sided and double-sided versions, each lamp runs ballast-bypass on 120-277V direct drive and produces 6500K white output for even cabinet brightness. The group also includes the matching cable mounting kits used to suspend the lamps. Designed for fluorescent-to-LED sign cabinet retrofits.