TechGrow Ballast Eco 4x600 is a plug-and-play lighting controller designed to switch up to four 600 W HID ballasts from a single unit. It uses a built-in mechanical 24-hour time clock with 15-minute segments, allowing up to 48 on/off events per day. In addition to timed operation, the front selector offers fixed On and Off modes for maintenance or testing. The Eco model focuses on straightforward, reliable relay control and does not rely on external sensors or data links. Typical use is coordinating photoperiods for multiple lamps in small rooms or tents while reducing manual handling of high-load circuits. The 4x600 variant sits within TechGrow’s lighting controller range alongside the 2x600 configuration.