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Best timers for seed starting grow lights: what to check

Any plug-in timer that handles the load will do. The hours matter more than the brand.

This is a buying checklist with two Amazon listings at the end. We have not checked their ratings in detail, so check the watt rating on the listing against your shelf's total.

The checklist

  1. Rating. Add up the watts of everything on the timer with the calculator or the table in linking bars to one timer. The total must be below the timer's label rating.
  2. Hours. Most sources say 14 to 16 hours a day, and Utah State says 12 to 14 or more. The timer must let you set that. See hours per day.
  3. Resolution. Mechanical dial timers usually switch in fixed steps. A digital timer can switch at exact times and may keep programs through a power cut. Check each listing.
  4. Plug fit. A grounded plug and enough space for the fixture's plug.
  5. Separate schedules. A fan wanted for short bursts, as Utah State describes, needs its own timer or schedule. See fans and damping-off.

Mechanical, digital or smart

  • Mechanical: simple and cheap. Easy to set wrong by a few hours, so check it after setting.
  • Digital: more exact. Check the display and how it keeps settings.
  • Smart plug: adds schedules by app. Needs your phone and wifi settings.

Some light bars, such as the Hydrofarm Jump Start fixture, are sold with a timer included. See the gear shortlist.

On Amazon

These are links to Amazon product pages, not affiliate links. We chose them from Amazon search results by title and customer rating. We have not checked their specifications line by line, so read the current listing before you buy. Prices change, so none are shown here.

Sources checked 2026-10-14. Pages on this site are researched, not hands-on tested.

Sources

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