Have you tried the "For Each" condition? Also, if it is enemies you're attaching said light probes to, maybe put them all in a family and then "For Each <family name>".
Also, for the probe itself, an every tick event that sets them to enemy.x/enemy.y. If the probe is also player-influenced, as if they can affect it (say, put out an enemy's light), also try "pick probe closest to player.x/player.y".