The Nano Freedom Plus is an excellent headlight. It is easy to install, the light weighs only 3 grams, and is cordless! The beam intensity of 40,000 lux provides excellent depth of field without being too bright & causing eye fatigue. Placing the batteries on the arms of your telescopes helps counter-balance the weight of high mag telescopes. If you are looking for a headlight, the Nano Freedom Plus should be on your short list to evaluate.