If you have a team that hits better than your light team, considering the element bonus isn't that game-breakingly high, I'd suggest you switch over to that instead.
Lilim sub fodder is... even debatable. The stats are pretty much SR level, so the only thing you have going for is the element boost. And well, there are other eidolons that provide the same boost, or even better. Ixion over thunder Lilim, for example.
When the raid eidolon store rolls about, that's instant degradation to orb fodder since everyone can buy Kaisers. If only they buffed these girls...