What components would you need to build a Arduino which turns on your main lights at a certain time

what would i need to build this project

You will need

  1. Arduino (to run code obviously :P)
  2. Relay (turn turn ON/OFF main light)
  3. RTC clock module (to allow relay control at certain time)
  4. power supply (to power all of above)

you don’t need arduino for this, you can buy a programmable timer

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Sorry I mean, you use an arduino to programme a switch to turn on a light switch(the one below)

so you are looking for mechanical turning from a motor controlled by arduino?

Yes I am. What would I need

have a look here Retrofit your light switch with this remote-controlled device | Arduino Blog

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