Thank you. It was an extremely confusing statement. I would have gone with something like "a wavelength about 7 to 40 times longer than the longest wavelength

Thank you. It was an extremely confusing statement. I would have gone with something like "a wavelength about 7 to 40 times longer than the longest wavelength human eyes can perceive", or "longer wavelengths than a night vision scope picks up, but shorter than most thermal imagers capture or microwave ovens emit". But really, it might make more sense to have just omitted everything after "mid-infrared wavelengths of light". Kind of like the unnecessary use earlier in the article of both parsecs and light-years. Just go with light-years IMO.