[Harvard English] shine a light on

[Speech Tips!!]

shine a light on  (Dictionary.com)

to reveal something about something; to clarify something

=take the lid off , unveil

This discussion has shed some light on the problem.

 No less significant was the introduction, around the same time, of the Am Law 100 ranking of firms by financial performance, which gave clients their first hint of the true costs and value of the services they were buying, along with a real basis for comparison among the top firms. By adding increasingly granular data, such as leverage and profits per partner, the Am Law rankings shone a light on the previously secretive operations of white-shoe firms.

[HBR Jargon!!]

White-shoe firm (Wikipedia, the free encyclopedia)

White shoe firm is a sometimes racially/culturally tinted phrase used to describe leading professional services firms in the United States, particularly firms that have been in existence for more than a century and represent Fortune 500 companies. It typically—but not always—refers to banking, law, and management consulting firms, especially those based in New York and Boston.