lamp / torch / illuminating light
Masculine noun. Plural: سُرُجٌ (suruj). Used for the sun (سِرَاجٌ وَهَّاجٌ, blazing lamp, 78:13). Also describes the Prophet: سِرَاجًا مُنِيرًا (33:46).
The Quran uses different words for light sources: the sun is a sirāj (lamp), while the moon has reflected nūr (light) - scientifically accurate imagery.