Is there a set number of shineys that will pop in each HA? When it says "4 bright points of light..." is that literal? There are 4 shineys?
Yep. So once you find 4 you can stop looking. There has been the rare occasion where more have spawned but are not part of the task, like in Crypt of Sul (?) there are shineys already spawned which will respawn and confuse the whole thing.