This little light is pretty amazing. The fluorescence of certain objects or elements is on a whole other level with this light. Rocks that barely had any glow to them at all using a regular UV light are crazy bright with colors using this light. This is a very serious light and you need UV blocking eye protection. Shining the light at objects without eye protection will hurt your eyes. Best just to keep the eye protection with the light.
Works well - very bright, the black glass filter is nice to reduce the visible portion of the beam.