Steve and I have already said a lot about the physical nature of Paul's experience with the risen Christ in recent discussions with Faith Slayer here and here. I want to expand on some themes I mentioned in those discussions.
The New Testament doesn't just say that Paul saw a light and heard a voice. We're also told that Paul saw Jesus (Acts 9:27, 22:14, 1 Corinthians 9:1). By contrast, Paul's companions are referred to as "seeing no one" (Acts 9:7). Notice, too, that Acts 22:14 uses physical language to describe Paul's hearing of a voice ("hear an utterance from his mouth"). That language could be used in a non-physical way, but those who take it that way bear the burden of proof. All of these passages in Acts about Paul's experience are in the context of Luke's two-volume work, in which he keeps referring to the physical nature of Jesus' resurrection (Luke 24:1-3, 24:39-43, Acts 1:3, 10:41) and how Paul's fellow apostles had physical experiences with the risen Jesus that qualified them as apostles (Acts 1:21-2, 10:40-1). In that context, when Luke refers to how Paul and/or his companions saw, heard, fell to the ground, were blinded, etc., it's absurd to conclude that the experience was subjective and/or non-physical.
It's also absurd to conclude that a body other than the body of Jesus that died was resurrected, as if he was merely given a new body of some type. What dies is what rises. The death is what brings about the need for resurrection in the first place. You could speak of receiving a new body as a resurrection, but that would be a less natural way of using such terminology. Anybody holding such a view would bear the burden of proof. Luke's gospel makes it clear that the dead body was the one that was raised, and it was seeing Jesus raised in that body that qualified individuals as apostles. Notice the emphasis on Jesus' crucifixion wounds, by showing his hands and feet, in Luke 24:39. Notice the continuity in Acts 1:21-2 and 10:37-41. The witnesses saw Jesus in the time leading up to his death and following it. The continuity of the body is suggested. And that continuity isn't just mentioned as a historical fact. Physically witnessing Jesus before and after his death was a requirement for Jesus' original disciples who became apostles. Paul isn't placed in that category, but he is portrayed, in Acts and elsewhere, as being an apostle with equal authority. Seeing Jesus in his physically resurrected state makes more sense of Paul's status as an apostle. People who saw visions of Jesus, like Stephen, have a lesser status than Paul.
Here's a post I wrote several years ago about the evidence for Paul's experience with the risen Christ.