In a good, bad, favourable, etc. light
Definition 1 of 3
Pro Tip 1/3Connotation Impact
The phrase can imply negativity or positivity, shaping someone's reputation or a situation's interpretation. 
Her speech put the new policy in a very favourable light.
Pro Tip 2/3Base on Evidence
Use the phrase to show that an opinion is based on specific information or actions. 
The mayor's response to the crisis cast him in a good light.
Pro Tip 3/3Subjective View
Remember, what's seen 'in a good light' by one may not be the same for another. 
She is seen in a good light by her friends, not so much by her colleagues.