With the new graphics all light sources give of barley any light.
Linked issues
duplicates 1
Comments 2
Duplicate of MCPE-4104 – If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.
Yeah, the new smooth lighting warps the light and makes it look like there is less. To fix, go to the "Experimental" section of Options, and turn off smooth lighting.