They are more reliable and easier to set up than the new electronic versions. I personally like the removable clips that set the on/off time. The only downside is that in a very quiet place you can hear the timer ticking. It's very, very quiet, but you can hear it. Because the timing mechanism is entirely mechanical, they wear out over time; it lasts about 3 years. I like the built in ground wire they have. I will continue to buy these because the price is good, they work with three plugs, and are easier and more reliable to install than electronic versions.
Plusmart Outdoor Digital Timer With Waterproof Light Sensor, Dusk To Dawn Control For Electrical Outlets (3 Pack + 6 Inch Extension Cord, 1/2HP)
30 Review
⏰ BN-LINK Short Period Repeat Cycle Intermittent Timer - Versatile 24 Hour Interval Timer for Day and Night Operations
9 Review
⏰ 7 Day Heavy Duty Digital Programmable Timer Outlet - Dual Electrical Outlet Timer with Two Independently Plug-in Grounded Outlets Switch, 8 ON/Off Programs - 3 Prong Timer for Light Lamp Fan - 15A/1875W by BN-LINK
9 Review
PlusMart 24Hr Mechanical Timer Plug Outlet - ETL Listed, 2-Pack For Lights & Fans
21 Review
Robertson Worldwide ISL432T8HEMV AH 3P20160 120-277V 50-60Hz High Power Factor 4 F32T8 Linear Lamp Fluorescent eBallast
6 Review
💡 Electronic FL Ballast ICN-4P32-N (Formerly ICN-4P32-SC) for 3-4 F32T8 F40T8 F17T8 Lamps, 120V/277V Compatibility
5 Review
💡 Hydrofarm Quantum QT400 Dimmable Ballast for 400W Grow Lights
5 Review
Fulham WorkHorse WH2-120-C Adaptable Ballast - 2 Pack
3 Review