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You can use Shift + F7 to toggle sky light calculation. Ctrl + F7 to toggle overlay display (1.12.2 & below)
Initial Version to 1.12.2-2.0.4
, (comma) to change the optimal torch position by plus one.
. (period) to change the optimal torch position by minus one.
[ (Left Bracket) to change the optimal torch position by plus one.
] (Right Bracket) to change the optimal torch position by minus one.
A derivative work based on the mod by oldjunyi known as Light level Overlay Reloaded which is also MIT LICENSED.
Original License by 4poc at https://github.com/4poc/lloverlay/blob/master/resources/LICENSE included here for posterity.
The source code is available at: https://github.com/4poc/lloverlay Light Level Overlay is licensed 3-clause BSD.
Copyright (c) 2012-2013, Matthias Hecker <apoc@sixserv.org> All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
This project is proudly powered by FORGE, without whom it would not be possible. Help FORGE get rid of Adfocus at https://www.patreon.com/LexManos.

Allows you to visualize the intensity of light rendered as numbers on the top of blocks. There's a default optimal indicator for light placement set for torches. It can be adjusted for other light sources. Use the square brackets to control its position.