Normal household timers are not built to take the high inductive loads produced by HID ballasts. Therefore, if used with an HID ballast, the contacts inside the timer that open and close the timed circuit will overheat and weld together, breaking the timer and leaving your grow lights permanently on.
Heavy Duty Timers are different and designed to take high loads and has no problem dealing with the inductive loads produced by a 600w ballast.
Looking for an alternative timer? Click here for all our irrigation timers
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