1) Buy timer that is rated for inductive, and not just rated for tungsten or resistive.
Rating usually appears in each product manual except with cheap knock-off timers or older timers that might not show rating or have rating sticker on timer.
http://waterheatertimer.org/Woods-timers-and-manuals.html#outdoor2) Digital timers work differently than mechanical timers.
Digital do not completely shut off the circuit, unless they are rated for inductive.
So inductive loads like CFL or LED will have slight glow.
3) ALWAYS plug outdoor timers into GFCI-protected outlet.
Unplug timer from wall when working with lights, and cords.
Stand on dry surface or plywood and never bare ground.
Plug timer directly into outlet, and do not use extension cord.
4) Don't use LED Christmas lights because they have no warmth and look cheap and un-inviting.
If you need further help, I’m available over the phone at
https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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