The Prophet (ﷺ) said this prayer in salat or in prostration:

اَللَّهُمَّ اجْعَلْ فِي قَلْبِيْ نُورًا، وَفِي سَمْعِيْ نُورًا، وَفِي بَصَرِيْ نُورًا، وَعَنْ يَمِيْنِيْ نُورًا، وَعَنْ شِمَالِيْ نُورًا، وَأَمَامِيْ نُورًا، وَخَلْفِي نُورًا، وَفَوْقِيْ نُورًا، وَتَحْتِيْ نُورًا، وَاجْعَلْ لِي نُورًا (وَاجْعَلْنِيْ نُورًا)، وَاجْعَلْ فِي نَفْسِي نُورًا، (وَفِي عَصَبِيْ نُورًا، وَفِي لَحْمِي نُورًا، وَفِي دَمِيْ نُورًا، وَفِي شَعْرِيْ نُورًا، وَفِي بَشَرِيْ نُورًا)، اَللَّهُمَّ أَعْطِنِيْ نُورًا

Allahum-maj'al fi qalbi nuran, wa fi sami' nuran, wa fi basari nuran, wa`an yamini nuran, wa`an shimaali nuran, wa amaami nuran, wa khalfi nuran, wa fawqi nuran, wa ta’hti nuran, waj`alli nuran (waj`alni nuran), waj`al fi nafsi nuran, (wa fi asabi nuran, wa fi lahmi nuran, wa fi dami nuran, wa fi sha’ri nuran, wa fi bashari nuran), Allaahumma a’tini nuran

O Allah, place light in my heart, and in my ears light and in my sight light, and to my right light, and to my left light, and before me light and behind me light, and above me light, and below me light. O Allah, Make for me light, and make me a light, and place in my soul light, and place light in my nerves, and in my flesh light and in my blood light and in my hair light and in my skin light. O Allah, grant me light.

Reference: Sahih Bukhari: 6316, Sahih Muslim: 763