illumination

noun [抽象名词]光亮，照明；启迪，阐明；<英>彩灯，灯饰；（旧时书上通常用手工绘制的）彩饰，彩图

The only illumination came from a small window high in the opposite wall.
惟一的照明来自对面墙上位于高处的一扇小窗户。