The phrase "a small flash of" is correct and usable in written English.
It can be used to describe a brief moment of light or a sudden realization or insight.
Example: "As she walked through the dark room, she saw a small flash of light coming from the corner."
Alternatives: "a brief glimpse of" or "a quick spark of".
But then she noticed a small flash of colour: amid the layers of rubble, several pink peonies had sprouted up.
Mr. Tynan attributes much of his success to the encouragement of others, and though he says he is not a "religious thumper" to the "Man Above," he revealed in the interview that in at least a couple of instances he has helped himself with a small flash of blarney.
A small flash of tanguero spirit takes hold – the music, the flamboyance, the leg kicks, the ability to grab a stranger and dance for four minutes emitting the vibes that you're wildly in love, then turn on a heel and walk off.
A small flash of resentment arose in the back of my mind as it dawned on me that all the doctors senior to me had been given a free pass, "grandfathered in" for the rest of their professional lives, while the rest of us would have to agonize through this grueling process every 10 years.
The sound — especially in a striking cover of "Dreaming" by Blondie — was stripped-down but powerful: a small flash of inspiration before SXSW's bright lights turn on.
The separate observations, one in Austria and one in Ireland, show a brief, small flash of light at the exact same time.
In a moment, a gratifying jet of beavery water came arcing out of the pipe, a small flash flood under the cedars, a portable tributary.
Or to put it another way: the cattle trucks, tubes, and buses of my transit await, but I'll be able to numb the crushing presence of my fellow customers by staring at a small flashing blob of plastic.
Near the rim, even in dim light, the eye moved toward one small flash of blue, a vanishing point on the horizon.
But that small flash of fame faded and he went on to face 12 subsequent years of continued relentless touring in relative obscurity.
A "Kellogg's paella" consisted of puffed Rice Krispies, to which the waiter added an intense seafood reduction; on the side were a small, flash-fried shrimp, a piece of shrimp sashimi and an ampule containing a thick brown extract of shrimp heads that you were instructed to squeeze into your mouth.
