I want to say I LOVE this mod and other mods like it.
It's such a helpful thing!
But there has always been a problem with them. A problem I hope gets solved.

As you can see, you have to be above the block, or else you won't see it.
The issue is in very dark areas you may not even notice a ledge above you.
You do see a few dots of red from a X but that's random noise based on how you view it, very very subtle.

It would be wonderful if we can see X's on all sides of the block (or the side mostly facing the player)
Could even retexture the block, just as long it tells the player "This block is in dark lighting" from wherever they stand looking at it.
Or even if the mod had a new option for a beam going above the block slightly (this would be perfect for surface lighting)

I know there's resource packs showing stuff like this, but not only do they show it for every single possible block/texture, it also colors
the mobs. So, all hostiles will blend in to well. Which is why this mod will always be my Goto.