I saw a sci-fi movie on tv back in the 70’s and a couple of scenes have stuck with me through the years. The movie was in color and everyone spoke English.
The first scene I remember is of a man in his home retrieving a small box he had hidden. He seems to be sweating or nervous or otherwise unwell. When he opens the lid of the box there’s a green light shining out of it. He basks in the light and the man is revived as if the light were a medication he needed.
The second scene I remember is of a young boy finding the box and opening it. The green light burns him and I believe it’s later revealed to be a severe radiation burn.
I also seem to remember something about aliens and a dam but that could easily be a different movie. Any help would be greatly appreciated!