Whether a light-based device helps with breakouts is only half the question. The other half is what you are asked to do once the sessions end. This article takes both halves for a reader in Ann Arbor, Michigan.
What the documented sources say
dermnetnz.org states the scope plainly: "Laser and light therapy are used to treat mild active acne and acne scarring." That sentence names the two uses, active acne and the scarring it leaves behind, and it does not promise a result for either. The word mild is worth noticing if your breakouts are not.
Where intense pulsed light fits
Intense pulsed light is one of the devices in this family. The article Current Trends in Intense Pulsed Light gives background on how it is used, and it is a reasonable place to start if you want to read beyond a practice's own description.
Follow-up and upkeep
If a practice proposes a course of treatments, treat it as a schedule, not a single event. dermnetnz.org keeps a page on intense pulsed light therapy that is worth reading before you agree to one. When a practice quotes a number of sessions, ask what happens to your skin and your budget after the last one.
What to ask before you commit
Ask whether your breakouts are mild, how the practice will tell whether the device is working, and when it would stop and try something else.