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But as expected, this quality UV radiometer sensor completely ignored the wavelength of light coming out of it. It should be noted that I was going to try to see how one of the common 21-LED 395nm Unfiltered UV flashlights would perform. The scale on the bottom is the number of feet from the UV radiometer the measurements were taken. The numbers on the left of the graph are in mW/cm2. As you can see by the numbers, light intensity drops off pretty quickly. When you move the light triple the distance away, the light will be 1/9th the intensity. It states that when you double the distance away from the source, the light will be 1/4th the intensity at the original distance. As you see in the graph below, the numbers follow the Inverse Square law. I left each light on for a few minutes to let voltage drop a bit and then conducted some quick range measurements. UV radiance measurements were taken at 2 foot intervals starting at 20 feet from my UVX radiometer 365nm sensor and decreasing down to 2 feet. I have conducted some "rough" observations of a number of UV flashlights in order to present a comparison for you. And I have seen rows of 5-gallon buckets of this rock. Certainly there are super-rich pieces found. On average, much of the Sodalite I have seen from Lake Superior areas is a varying mix of fluorescent Sodalite to non-fluorescent Syenite. The richness of the piece would define how bright the rock reacts to UV. Some localities produce solid masses of minerals where others may have crystals in a non-fluorescent matrix. Fluorescent minerals from different localities react differently. But that is NOT always the case with most other longwave UV reacting minerals. Canadian Wernerite and Greenland Sodalite are some of the brightest longwave minerals on the planet! Some of the latest high power UV LED flashlights will allow your eyes to find this material starting at around 80-100 feet away. But some of the material responds almost as bright under longwave UV as well. Willemite from Franklin, New Jersey glows an intense green under shortwave ultraviolet light. What minerals you are collecting? The human eye detects certain colors in dark environments better than others.
When comparing flashlights, one of the biggest factors defining the useful distance of the flashlight is rarely talked about. Certainly, the number of LEDs in a light, LED output, reflector quality and shape, battery voltage and numerous other variables factor into what makes one light more useful than another.
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