Works great with cheap UV LED lights
I got the two-pack of these glasses to go along with the 51-LED light I bought to hunt down pet urine. Contrary to what some of the one-star reviews claim these DO seem to block a substantial amount of ultraviolet light, as I found out by placing them between my new UV flashlight and my UV-reactive driver's license.<br /><br />These glasses make all the difference when I'm using said flashlight, by the way. Like most cheap UV LEDs there's a lot of bleed-through into the purple visible-light spectrum meaning that the visible light it emits may be enough to wash out the dimmer florescence of the organic stains you're looking for. The glasses seem to filter out the near-UV purple light just as well as it does UV which increases the contrast significantly. What look like faint stains become vivid and what was completely washed out by the visible light becomes noticeable.
Rating: 5 stars