Number + 道 + 光
光 (guāng) is a noun meaning "light" or "ray," and can also function as an adjective meaning "bright" or "bare." As a noun, it refers to visible light or radiance. For example, 一道微弱的光 means "a faint beam of light."
阳光的光照进了房间,暖暖的。
Yángguāng de guāng zhào jìn le fángjiān, nuǎnnuǎn de.
Sunlight shone into the room, warm and cozy.
月光洒在湖面上,特别美。
Yuèguāng sǎ zài húmiàn shàng, tèbié měi.
Moonlight spilled over the lake surface; it was especially beautiful.
这盏灯的光太暗了,换一个吧。
Zhè zhǎn dēng de guāng tài àn le, huàn yī gè ba.
The light from this lamp is too dim; let's replace it.