Using these you can automate staircase lights. Will automatically turn on when someone is on the stairs. And turn off when he has left. No need to press switches for every stair.
Helpful for Fajar prayers in the mosque.
Plus, as these are basically holders, you can use any bulb. And once the bulb gets fused, can change the bulb by buying one from the street side shop, and the system will work just fine with the new one.
I have one such system installed at our home. But it works a bit differently, more complex solution. People that ask me how I do it, here's the more simpler one.
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