Very early 50's. All I remember is a person holding a candle and saying in a low voice the exaggerated, "and this is lights out." Used to scare me. The program must have been similar (it was a regular) but since I can't remember anything else (too young) what do I know. Furthermore, nothing can compare to Twilight Zone in my opinion.
There were all sorts of radio shows (Inner Sanctum, Lights Out, Dimension X, Suspense...).
Most (if not all) are public domain now and can be found on CD (or mp3). I even heard a Rod Serling radio show from the 1960s.
Ah -- sounds cool!
I was born in '64, so I missed that, I'm afraid.
I will try to remember to find some DVD's tho.