by Robert Fisher.
It was about the eye and night vision . . . how the rods and cones work, etc. here was his conclusion about a good all-around light for on board . . .

You can go high-tech and use electronic gadgetry to produce a broad-band, continuously variable light, or you can go low-tech and use an option that’s widely available and has been around for ages. It’s the variable-wick oil lamp. It has both qualities you’re looking for, a relatively broad-band light to engage all the retinal receptors and a continuously adjustable light output that will let you fine-tune to the minimum-to-get-the- job-done ideal level.

Turn down the wick for romance . . . turn it up for reading. Sounds good to me . . .