Q&A for How to Make Lights That Turn on at Night in Minecraft

An opaque block is any block you can’t see through. It doesn’t refer to one specific block, but many.

You can, but you will need to turn on the lamp every night and turn it off during the day.

Well, the daylight sensor is the only sure fire way to get a light/door to open at night. You could, however, set a pressure plate inside a one block wide house and spawn a villager outside it. At night he will enter to stay safe and stand on the pressure plate, turning on the light/door.

Opaque isn’t a block. It describes a block. An opaque block is any block that isn’t transparent, meaning you can’t see through it.

You cannot do this. Instead, you must set up a redstone not gate to reverse the effect.

Mine it when you are mining below level 12 in Minecraft or find it near lava.

Yes. Go to creative mode to make the job easier, and search daylight sensor. Select it then a random slot in you're hotbar, just make sure there's nothing in it. Now place the sensor wherever you want and to turn it into a nighttime sensor get close to it, and right click it, if on mobile there will be a button. Now to make something turn on at night time, make a redstone path to what you want to turn on at night. There you go, mission accomplished.