Lumina is strong already for pve content, giving it anything else would put it over the top. The perk gives you health regen an a dmg boost with minimal uptime, w/caty that uptime is even lower. An in end game content especially if there's a champion mod for HC that season lumina can get nasty, on demand health an dmg boost which can be saved, when stowed, the HC is good where its at.

Personally, osmosis doesn't make alot of sense since it's supposed to be a light based weapon about healing, and opposite thorns 'life draining'. If it was to be reworked, probably add a shield for every heal orb you send out. Not a shield like the heir apparent, but perhaps a weaker version of void titans' barrier overshield. Tbh, don't use lumina that often, if at all, apart from when doing original quest and catalyst a few years back. If they did add anything like an overshield, it would become sort of useless, let me explain: Need heals? *warlock rift Need overshield? *void titan barrier aspect Another idea I propose could be a form of firefly that gets larger or spreads further depending on how many 'levels' of lumina's heal perk is. This would make it a great option for backup heals and ad clear. Perhaps all of the ideas can be added in some way, osmosis but only for light based subclasses, overshield for defeated enemies or fireteam members healed, and firefly based around the level of heal orbs 'stored'. Just like OP, just thought if this while writing, so by all means, add or criticise to my version of the idea....