Found a bug in version 1.4.8
The loot table for rare loot crate has duplicate helium lights. The alchemistry mod has 5 types of lights, i assume instead of duplicate helium there should be neon light.

Also, the achievement bright lights requires 6 types of chemicals, 5 of which are used to make lights, the exception being radon. (Radon is not used for neon lights irl either.) However, they are all noble gases, thus have a relation, so i'm not sure whether this is intentional or not.