Experience orbs are affected by light levels just like normal items and entities rather than being at max brightness regardless of the light level around them (like spider eyes).
Steps to Reproduce:
- Start a creative world
- Go to a completely dark area
- Obtain bottle of enchanting
- Throw it on the ground
You'll notice that the exp orbs are dark and hard to see.
Does not appear to affect 1.14.60.
Experience orbs is not as usual he affected by lighting