The Light Level Overlay modification will add the ability to see the lighting level on any block. This is useful in that you can now find out where hostile mobs will spawn more often.
When the function added by the modification is turned on, numbers will appear on the blocks – this is the indicator of the lighting level. From 1 to 7 it will be red, above and up to 14 it will be green.
The modification has one drawback – it shows this value only on the surface of the blocks and cannot represent it on the side or top ones, for example, on the walls or ceiling.
To enable the function, press F4 or F7, or look in the control settings.
You can also change the display of illumination to spawn/do not spawn (Shift + F4)
How to install the mod:
Download Light Level Overlay mod
1.9.4 \ 1.10.2:
1.16.4 \ 1.16.5: