Light modifier

A light modifier is crafted like this where v=void ingot, r=redstone and g=glow stone. (See my page on void ingots to find how to get them.)

g-r-g

r-v-r

g-r-g

The light modifier, as you may expect, allows you to change lighting to the 10 blocks closest to it in all coordinates by default. To change the light simply right click on it or tap on it if your on mobile. It will show a menu that has three sliders on it. The first slider allows you to change what light you want it to be. The second slider disables mob spawning or enables mob spawning in that area. The third slider allows you to make the area of effect smaller or larger up to the default size(10 blocks).