Please watch the video.
When Vibrant Visuals is enabled, having night vision does not increace the visual light level of the blocks that have a lower vanilla light level.
This may relates to MCPE-217248 and MCPE-219401
MCPE-219624
Vibrant Visuals: Night Vision is not working.
Resolved
Duplicate
1
This issue is being tracked at MCPE-201809.