I love how Lon's climbing bike on the double Transcontinental had a 42x21 low gear and that the flashlight fell off the bike leaving Harlem on I suppose the racing bike with a 13-18 corncob that he rode an 8 hour and change double century a few weeks earlier.
Good lights were almost impossible to get back then. I had a custom set. Ugly, ugly. 12V tractor light powered by a big expensive nicad battery (maybe 6V, I forget). I had four different bulbs IIRC. 25 W, 15W, 10W, and 5W. I had to use the 5W on brevets in the later 80's to get enough hours out of the battery. I commuted using the 15W bulb and it was really good for the day. In the 90's I fashioned a lithium battery pack using 4 D cells to a night rider halogen lamp. Cats meow. The batteries were not rechargeable and were wicked expensive. How things have changed. Cars now run on batteries. I run my battery powered headlamp every time I ride and only need to recharge it every week or two.