Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Light in a dream is guidance, knowledge, and the Quran. Emerging from darkness into light is repentance from sin and guidance after misguidance. Whoever sees himself wearing a garment of light will gain useful knowledge. Bright light indicates righteousness in religion and worldly life.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Light indicates righteous work. Whoever sees light shining from his body will gain knowledge and guidance and become famous for righteousness. Whoever sees himself following a light is following the truth and the Sunnah.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Light is interpreted as Islam, knowledge, and wisdom. Walking in the light is uprightness on the truth. Whoever sees a dark place where light shines, God will relieve the worries of its people.