TServo2049 said:

Also I have read elsewhere that Barry Nolan at Van der Veer Photo Effects did the glows. But maybe that was only some scenes?

Interesting. They are credited all right. It sure makes sense that there was several guys being responsible for the lighsaber effects in the original film when some of those effects looking quite different from each other.

Besides Van der Veer Photo Effects and DePatie-Freleng Enterprises there are three other companies listed under additional optical effects:

Ray Mercer & Company
Modern Film Effects
Master Film Effects

No idea what their work encompasses. Maybe time to take a look in Rinzler's making of again.

Adam Beckett was the guy who did all the laser bolts in the film, he also did the animation work on Artoo when he's captured by the Jawas but he was an in-house special effects guy.

TServo2049 said:

I forget, was that glow on the ceiling beam in the original shot there on the whole shot, or was it an "environmental" glow that was double exposed in only during that impact animation?

The ceiling beam only got "painted" in the Special Edition redo, and only during two impact animations IIRC. Are you suggesting the shots were optically recomposited instead of digitally? Sorry, not sure if I understood your question.