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Jason B asked How can I tell if a UV LED is emitting true UV light?
I bought a UV flashlight off ebay, and im trying to figure out if it emits true UV light. How can I determine if it is?
And got the following answer:
The best way to tell if a UV light emitting diode is in fact emitting UV light (and not just purple) is to see if any UV reactive substance is excited by it. Laundry detergent, paper, and some plastics all contain chemicals called optical brighteners. These are chemicals that fluoresce under UV. Especially the more expensive versions of each respectively. try spreading a little laundry detergent out on a glass or wood surface and shine the light on it in a dark room. Since laundry detergent it essentially clear it will appear to be the same brightness as the surface it is on if there is not UV (verify this with an incandescent flashlight) but the detergent will be significantly brighter under UV light. Almost all "white" LED's emit a significant amount of UV. A cheap UV flashlight is made by blocking the visible light rather than the UV, which is the standard configuration. These UV LEDs will generally only emit UVA, the longest of the UV wavelengths and the least useful for scientific applications. A true "UV" emitter also emits UVB and sometimes UVC the progressively shorter wavelength variants. Here is a way to test if you light emits UVB or UVC: glass absorbs UVB and UVC but not UVA very well. This means that if you shine a through a piece of glass, the UVB and C will be "cut." So to test if there is UVB or C present coat both sides of a piece of glass (preferably thick glass) with Laundry detergent. apply the detergent such that the edge of the section on detergent on one side is right next to the opposing edge of the detergent on the other side. (I would use a piece of black tape to mark the border) Then shine the light on the glass in a very dark room (I suggest waiting 5 minutes for your eyes to adjust) then look at the glass with the light on it for a few minutes. You should begin to be able to distinguish a difference between the two sections of detergent. The greater the difference between the two the more UVB/C is in the light emitted by the LED. If you see no difference it either means that your light only has UVA or the glass is not blocking enough UV. BTW I wouldn't use a "UV" blocking glass for this test as it will also block UVA and skew the results. Final note: UVB should be considered as hazardous to the eyes as a class 3 laser, follow the same precautions. UVC is as dangerous as class 4. more on that here: http://en.wikipedia.org/wiki/Laser_safety