m0useanswered grow question 3 years ago ELECTRIC: Quiet and do not make noise when in operation, keep time/programming with battery backup, accurately holds time, multiple programs. "Not designed for 600w+ lights."
Single unit device,
https://www.amazon.ca/Digital-Programmable-CANAGROW-Electric-Grounded/dp/B07MC2MJG4/
Dual unit device.
https://www.amazon.ca/Electronic-Programmable-Electric-Appliances-Programs/dp/B08D9RV3XN/
MECHANICAL: makes some noise while in operation, on power outage they stop recording time and do not accurately record time, will have to readjust every month by a few min. Some models can take high watt lights.
https://www.amazon.ca/Century-Heavy-Mechanical-Timer-Grounded/dp/B00MVFF59S/ref=sr_1_1?keywords=sunblaster+timer&qid=1644762904&s=hi&sr=1-1