Contradiction with 1 John 1:5
Isaiah 5:30 describes darkness and distress, whereas 1 John 1:5 states that God is light and in Him is no darkness at all.
1 John 1:5: This then is the message which we have heard of him, and declare unto you, that God is light, and in him is no darkness at all.
Contradiction with Psalm 23:4
Isaiah 5:30 speaks of a day of darkness and trouble, while Psalm 23:4 expresses fearlessness even in the valley of the shadow of death, due to God's presence.
Psalm 23:4: Yea, though I walk through the valley of the shadow of death, I will fear no evil: for thou [art] with me; thy rod and thy staff they comfort me.
Contradiction with John 8:12
Isaiah 5:30 mentions darkness, but John 8:12 quotes Jesus saying He is the light of the world, and those who follow Him will not walk in darkness.
John 8:12: Then spake Jesus again unto them, saying, I am the light of the world: he that followeth me shall not walk in darkness, but shall have the light of life.
Contradiction with Revelation 21:25
Isaiah 5:30 depicts gloom, whereas Revelation 21:25 describes the New Jerusalem, where there will be no night.
Revelation 21:25: And the gates of it shall not be shut at all by day: for there shall be no night there.
Contradiction with Isaiah 60:19
Isaiah 5:30 speaks of a roaring sea and gloom, but Isaiah 60:19 promises that the Lord will be an everlasting light, eliminating darkness.
Isaiah 60:19: The sun shall be no more thy light by day; neither for brightness shall the moon give light unto thee: but the LORD shall be unto thee an everlasting light, and thy God thy glory.