The phrase "a source of light" is correct and usable in written English.
It can be used to describe something that emits light or provides illumination.
Example: "The candle served as a source of light during the power outage."
Alternatives: "an illumination source" or "a light provider".
Danny was truly a source of light and joy for all who knew and loved him.
Tolson becomes the moon over Hoover's shoulder, a source of light in the shadows.
The sheer luster of her presence is often startling; I know of no dancer today who so gloriously seems a source of light.
The small flame of a candle is more a source of light than heat, and that takes it out of the carnal realm.
Graham Beck's salmon-pink 2006 Brut Rosé demonstrates the bright potential of South Africa as a source of light sparkling wine.
Usually, people in temporary camps sell anything that they can get their hands on but a source of light, radio, and a charged phone was valuable enough for them to hang on to.
Because petroleum displaced whale oil as a source of light and lubrication more than a century ago, it might seem logical to join workers in Arabian oil fields or on drilling platforms at sea.
The work's play on memory and forgetting (the house literally becomes a source of light, but is also designed to block your view into its brushed metal walls) harmonizes with Benjamin's interest in dreams and a collective unconscious.
Ms. Saariaho's fascination — more accurately, obsession — with light shines through recent works like her concerto "Notes on Light" (2007), in which she envisions the solo cello as a source of light.
Attention should be paid to his habit of painting dark colors over bright ones to create a subtle underglow and his frequent emphasis on blank canvas as a source of light and texture.
They lack definition, substance, but there is a causal relationship between a person and their shadow — specifically, a shadow is the result of a material interaction between a person and a source of light.
