DIY Red-Llght Head Light

You might ask, "Who would want a red-light head light?" Well, amateur astronomers, for hands-free seeing at night, especially if they're carrying or handling equipment, such as telescopes. Other night-sky observers might want to wear them for being able to walk around without bumping into people or items, and they can retain night vision while viewing objects, whether through telescopes or binoculars at night-sky watching events. Read the entire article and comment there, please.