Crystalite helmet should give player "blindness resistance" when equipped. Similarly, chestplate gives haste effect and boots give speed effect. Wearing full set gives regeneration effect.

These effect bonuses can be viewed in codes of BetterEnd, see https://github.com/paulevsGitch/BetterEnd/blob/master/src/main/java/ru/betterend/item/CrystaliteArmor.java for example.