Yes, you can, though in somewhat silly way. If 32eu current is split 7-ways, you get ultra-low voltage with packets of 5 or below. So, either connect bat box to 7+ luminators that never has full storage (may be just use 64 luminators/batbox?), or add 7 LVTs that return current back into batbox.
And I never heard about luminators killing mobs.
That sounds doable gotta try that.
And yeah they kill mobs, just tested it in single player. It work on every aggressive mob except for those immune to fire (FIRE not SUNLIGHT) so blazes, magma slimes, pigman zombie are safe and for some reason slimes are too. And endermen, even though they are "neutral" they start to burn when right on top of luminators like the other mobs.