When you see this: Br2 with light, think free radical halogenation. In this case, ortho/para/meta designations will be irrelevant. The only thing here that can be affected by by free radical halogenation is the ethyl group. Like always, add the Br to the most substituted carbon (unless you reacted Br2 with a peroxide, like ROOR. Then you would add the Br to the LEAST substituted carbon).
Also, don't forget to look for any kind of shifting that would give a better, more stable carbocation. For instance, if you had a propane group attached instead of methyl, the propane would shift to give a more stable carbocation (tertiary) instead of secondary.