Beacon Bug Zapper (Beacons attract and deal damage to certain mobs)

The beacon beam should attract certain mobs and deal them damage. I think the two mobs that should be considered are bats and phantoms. Additionally, an alternative could be having the beacon repel these mobs instead of deal them damage

I mean, to get a beacon, you have to defeat the Wither and then get at least 9 blocks made from precious materials, just to make a pretty light. It takes up to a hundred blocks to get the beacon to give you any potion effects. I think they could be made to do a little more if we have to go through all that trouble