Everything used to have a meaning, symbol or represented something. We have traditions while do not know the origins.
I have a whole bunch of those big bulb colored lights from my grandma’s collection. She never threw anything out. LOL. I dare not use them.
I had to search what bubble lights are. Very interesting. If I were a kid, I’d get into trouble for wanting to spin them!
I do miss the candles on the Christmas tree. We’d light the candles and just sit there for a while watching them in a darkened room. It was so peaceful and soothing. Us kids had to sit quietly.
Here's a site filled with nothing but the history of electric Christmas Tree lights. The link is to 1930 - 1940, since that would have been my mother's early childhood, there's one of the earlier weatherproofed outdoor light sets on this page, but the stunner is the solid glass art deco light up stars, those are awesome.
http://www.oldchristmastreelights.com/1930_1940_2.htm
If you want to look at other time periods, click the index link at the top right of the page.