The incident happened at about 10 a.m. at 4495 Mission St. between Excelsior and Santa Rosa avenues, San Francisco Fire Department spokeswoman Mindy Talmadge said.
Muni spokesman Judson True said it appears that the trolley pole of a 49 Van Ness-Mission bus traveling on Mission Street at Santa Rosa Avenue reportedly became stuck in a support wire for the overhead Muni wires.
The trolley pole caused the support wire to vibrate, which appears to have dislodged two streetlights, one on either side of the street. The falling lights hit two pedestrians, True said.
The elderly man was taken to a local hospital and is expected to survive, Talmadge said.
The second pedestrian refused medical aid.
Muni service on Mission Street in the Excelsior District was disrupted for about 45 minutes, True said.