[Issue] Brightness level setting affects shadeless enviorements

[Wackyblocks]

Brightness level setting affects non-lit enviorements

chaning the non lit brightness does not really make sense, since its supposed to represent "true color"

Blockbench 4.3.1

[JannisX11]

Hmm, not sure, there might be cases where people want to disable shading, but still change the brightness. It could be an option.