The word(s) "darkness" appears 37 time(s) in 34 verse(s) in Quran in Mohsin Khan translation.

(11) When the night covered him over with darkness he saw a star. He said: "This is my lord." But when it set, he said: "I like not those that set."

(12) It is He Who has set the stars for you, so that you may guide your course with their help through the darkness of the land and the sea. We have (indeed) explained in detail Our Ayat (proofs, evidence, verses, lessons, signs, Revelations, etc.) for people who know.

(13) Is he who was dead (without Faith by ignorance and disbelief) and We gave him life (by knowledge and Faith) and set for him a light (of Belief) whereby he can walk amongst men - like him who is in the darkness (of disbelief, polytheism and hypocrisy) from which he can never come out? Thus it is made fair-seeming to the disbelievers that which they used to do.

(14) For those who have done good is the best (reward, i.e. Paradise) and even more (i.e. having the honour of glancing at the Countenance of Allah جل جلاله). Neither darkness nor dust nor any humiliating disgrace shall cover their faces. They are the dwellers of Paradise, they will abide therein forever.

(15) And those who have earned evil deeds, the recompense of an evil deed is the like thereof, and humiliating disgrace will cover them (their faces). No defender will they have from Allah. Their faces will be covered as it were with pieces from the darkness of night. They are the dwellers of the Fire, they will abide therein forever.

(16) Say (O Muhammad صلى الله عليه و سلم): "Who is the Lord of the heavens and the earth?" Say: "(It is) Allah." Say: "Have you then taken (for worship) Auliya' (protectors) other than Him, such as have no power either for benefit or for harm to themselves?" Say: "Is the blind equal to the one who sees? Or darkness equal to light? Or do they assign to Allah partners who created the like of His creation, so that the creation (which they made and His creation) seemed alike to them?" Say: "Allah is the Creator of all things; and He is the One, the Irresistible."

(17) Alif-Lam-Ra. [These letters are one of the miracles of the Qur'an, and none but Allah (Alone) knows their meanings]. (This is) a Book which We have revealed unto you (O Muhammad صلى الله عليه و سلم) in order that you might lead mankind out of darkness (of disbelief and polytheism) into light (of belief in the Oneness of Allah and Islamic Monotheism) by their Lord's Leave to the Path of the All-Mighty, the Owner of all Praise.

(18) And indeed We sent Musa (Moses) with Our Ayat (signs, proofs, and evidence) (saying): "Bring out your people from darkness into light, and remind them of the Annals of Allah. Truly, therein are Ayat (evidence, proofs and signs) for every patient, thankful (person)."

(19) And We have appointed the night and the day as two Ayat (signs etc.). Then, We have obliterated the sign of the night (with darkness) while We have made the sign of the day illuminating, that you may seek bounty from your Lord, and that you may know the number of the years and the reckoning. And We have explained everything (in detail) with full explanation.

(20) Perform As-Salat (Iqamat-as-Salat) from mid-day till the darkness of the night (i.e. the Zuhr, 'Asr, Maghrib and 'Isha' prayers), and recite the Qur'an in the early dawn (i.e. the morning prayer). Verily, the recitation of the Qur'an in the early dawn is ever witnessed (attended by the angels in charge of mankind of the day and the night) .