Buttons on and off

Hello,

I am working on course  with simulations that includes lots of buttons, how do I make it to where the user clicks a button and a light turns on when they click it and turns off when they click it again. I figure out the trigger to make the object of the light appear when the user clicks it but not to turn off when they click it again. Any help would be gladly appreciated. Thank you.

 

Alma 

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