Which preposition to use with sidelight

on Occurrences 15%

They not only give good sidelights on an event that will loom large in history, but they show the indomitable cheer and high spirit of our soldiers.

of Occurrences 3%

Many States have purely individual problems that do not concern the other States and do not come in conflict with them, but even in these the Governors may gain an occasional incidental sidelight of illumination from the informal discussion in a conference that may make thinking clearer and action wiser.

by Occurrences 2%

Edited with sidelights by Grace Crile.

Which preposition to use with  sidelight