The phrase "a major light" is correct and usable in written English.
It can be used to refer to something that is significant or important, often in a metaphorical sense, such as a guiding influence or source of inspiration.
Example: "Her contributions to the project were a major light that guided the team through challenging times."
Alternatives: "a significant influence" or "a key beacon".
A major light was snuffed out for the Jewish people.
Honda is shedding a major light on this problem by starting the Project Drive-in campaign.
I'm not saying the discussion shouldn't be fun, and that there isn't a major light side to the mystery of human sexuality.
Previous studies using transgenic mice [1], [2], [3], [4] or SCN slice cultures [17], [18] suggested the involvement of PACAP signaling in light- and/or glutamate (a major light transmitter)–induced phase shifts.
Susan Bloom, a spokeswoman for Philips, a major lighting manufacturer, said that her team was still combing through the lengthy document, but strongly supported the Energy Department's efforts.
As the outer wall of the hurricane swept over the coast in the afternoon, trees were quickly flattened, landslides tumbled along a major road, light poles were toppled and roofs flew off.
Their position should be a major guiding light for all different areas of the UN activity.
Decide where your major light source is (represented here by a scribbled ugly sun).
In dinoflagellates, carotenoids are the major light absorption pigments [51].
The company completed a major efficiency lighting retrofit last year at all of its 286 centers, replacing old fluorescent bulbs with more efficient lighting designed to save the company $3 million a year.
As I straggled out of the theater among the crowd of spectators last Friday, leaving squalid Moscow inside for the damp London evening, I saw a smart new retail development: a gleaming gym, the offices of a major bank, lights reflected in puddles.
