The turning on and off time of street lights has changed. How did they make it?

There are many street lights in a parking lot that used to light up and turn off together. I guess they have a timer. Agora, according to the weather, their turning time has changed. How did that happen?
  • The time setting on the timer has changed.
  • The control center controls the time when they should be on and off.
  • They use digital street light controllers, which change the time according to the time table of sunrise and sunset.
  • The lights are equipped with light sensors so that they can light up or turn off depending on the surrounding light.

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How many lumens do I need for outdoor flood light?

I need several outdoor flood lights for different uses. But I am confused about the brightness of the lights. Can you tell me how bright they should be for different applications?

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