"lesser numbers" is correct and usable in written English.
You can use it to refer to a smaller or fewer amount of something. For example, "The company had lesser numbers of employees this year than last year."
It also depicted lesser numbers of cars and guns.
In lesser numbers are names like Butcher, Postman, Brewer, Printer, Pressman, Scribe and Scrivener.
In lesser numbers, snowboarders have been swapping their boards for skis.
There are always those who suffer from this illness, in greater or lesser numbers".
Such movements, involving lesser numbers, still occur in parts of Namibia and in Botswana.
The report notes ethnic Kyrgyz also suffered, though in lesser numbers.
When the grouse are abundant, their large populations are prone to parasites that reduce them to lesser numbers.
The message was clear: what happened at My Lai 4 was not singular, not an aberration; it was replicated, in lesser numbers, by Bravo Company.
Periodical cicadas are distinct from the species that emerge annually, in far lesser numbers, and sing in the dog days of summer.
He predicted that voters for the Socialists and Free Democrats would vote in far lesser numbers now that the Justice and Life party has been eliminated.
Like granulocytes, monocytes are produced by stem cells in the bone marrow and circulate through the blood, though in lesser numbers.
