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~400W for one socket if that is all on the circuit is plenty. Question is: what else is on the same circuit linked to the breaker. Find which breaker shuts down the socket you will be using .. then shut it down and check what else is shut down and what else will be using and add them up. 400W is not much but it is persistent. Be wary especially for things like electric kettles (though IIRC not a big thing in US ), toasters, microwaves, heaters.15A 120v 1800 watt is standard US outlet and I'm assuming I have that. I think these strip draw like under 100w each. I was going to get 4 of them so one outlet should be fine. Is this what you mean?
Should I just take the 4 plugs from the 4 separate LED strips and connect them to one beefy power strip and have that one 1 timer? Is probably the best way right?
check the socket Amp rating (probably 10A or 16A here in europe) Multiply by voltage and you get power x 110V = 1100W
Now however you split it is on you.
I would multiply my load by 5% for every extension cord in between load and socket if I'm really pedantic.
Use high quality 'fat' wired extension cords especially if you are above 50% of rated load.
Also keep in mind that 10 or 16A rating is for the circuit to the breaker in the breaker box - if multiple socklets use the same breaker ... well you have only one 10 or 16A circuit for all those sockets.
For a reef tank I highly recommend wiring up at least 1 dedicated circuit (eu aka 230V) or 2(US 120V) with a dedicated gfci breaker in the breaker box (well I guess gfci sockets also work but here in EU we use gfci breakers in the breaker box)