THE LIGHT DURING THE PLAGUE OF DARKNESS [#18690]

How can it that the plague of darkness in Egypt was a “light” for the Jewish people, if it was a plague that killed 80% of the Jewish people and all night they were burying their Jewish brethren (as Chazal said)? How could this be a time of “light” for them if there was seemingly no more troubling period for the Jewish people than this?

The light itself was sifting out and destroying the reshaim !