At the moment, both these guns are just falling behind its competitors and hard light is just looked at as a weapon to -blam!- with or for puzzles that require multiple damage types, so heres some ideas that could replace or go over the current traits.
Hard light:
Void - Every 10 Bullets Inflicts Weaken
Solar - Slowly Scorches Targets with more scorch if Ember of Ashes is equipped
Arc - Reloading after a kill Causes the next Target to Jolt (Just Voltshot)
Borealis:
Void - Precision hits Supress Targets
Solar - Precision kills Ignite the Target (3 Sec cooldown good)
Arc - Hits Jolt the Target
If this is too big of a buff, I think adding Elemental Capacitors to their catalysts would be huge.
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Hardlight just feels fat in the hands