What is the difference between these two sentences?

Question

Hello, I encountered two sentences: Se apaga la luz cuando tocan el timbre a las diez. Se apagará la luz cuando toquen el timbre a las diez.

I wonder what is the difference. Gracias.

Answer 1

1. Lights off when the bell sounds 10. The light will go out/be turned off when the bell sounds at 10.