PhotonWrangler
Flashaholic
I stumbled across this UV LED bulb at Wally World today so I picked one up. It has an edison E26 base and a clear dome with a single LED in it.
Powering it up, it does produce fluorescence, although with some visible purple light, This suggests that it is one of the longer wavelength LEDs, probably closer to 395nm than the classic 365nm blacklight wavelength.
Placing a woods glass filter in front of it confirmed this; the fluorescence completely disappeared with the filter in place. This shows that there is no 365nm energy coming from this LED. I was somewhat disappointed, although this wasn't completely unexpected for a $7.00 lamp.
As a point of comparison, the Feit filament LED blacklight bulb produces the same result with the woods glass filter. In my opinion, either bulb would be good enough for basic blacklight effects but not suitable for differentiating currency security strips or stamp collecting.
Powering it up, it does produce fluorescence, although with some visible purple light, This suggests that it is one of the longer wavelength LEDs, probably closer to 395nm than the classic 365nm blacklight wavelength.
Placing a woods glass filter in front of it confirmed this; the fluorescence completely disappeared with the filter in place. This shows that there is no 365nm energy coming from this LED. I was somewhat disappointed, although this wasn't completely unexpected for a $7.00 lamp.
As a point of comparison, the Feit filament LED blacklight bulb produces the same result with the woods glass filter. In my opinion, either bulb would be good enough for basic blacklight effects but not suitable for differentiating currency security strips or stamp collecting.