Osram Zelion? HL100/HL300 LED controller is designed for Horticulture Fixtures. The controller allows the grower the ability to utilize the fully dimmable functions of your HL300 from 100-600 watts. This also enables the spectra tunable aspect of your HL300 LED light fixture designed for horticulture applications. A control box for connecting the fixture or up to a series of 49 fixtures and the computer software are included. This software is to be installed on a windows PC and the whole system can be up and running in minutes.