120V Track systems are modular and can be designed for multiple applications in nearly any interior environment. J2 Track is a two circuit track system that can control lighting fixtures separately through two switches. Any "J" style fixture can work on a J2 track system. Octagon box covers are used with J2-IPWR, J2-LE, J2-LRIGHT, J2-LLEFT, J2-T and J2-X to cover connectors where power is supplied through.