Telos GrowcastOverview Telos Growcast is a universal lighting controller that helps growers to save energy and grow better plants. Designed with compatibility in mind, this controller can be used with any dimmable light on the market. General Information Wirelessly connect to Growcast and control the Precise PPF output (dimming) of your grow light. Say goodbye to mechanical timers by applying on off timing schedules with an optional sunrise and sunset feature.