I actually just purchased the 502b AND a 9 uv led and they both aren't very useful for detecting fake IDs and cash... I spent about $15 for just the 502b bulb and it's wavelength is 390-400. Try shining it on an ID with uv markings, it'll still light up the markings, just not very well. The "Urine off" UV led tends to light up every uv hidden item on the IDs as well as cash. Most of the WF501B's light is white light because it's at the end of the wavelength spectrum. Bright doesn't equal useful.
from 400nm up is called the blue spectrum and stimulates the blu cones and strangely also a little bit the red cones in the eye and creating an purpleblue also called violet color. Because we don't have cones for UV we can't see the real color of UV also the lens in the human eye blocks UV making the UV can't reach
the retina in the eye.People that have undergown cataract surgery mostly can see UV but to them it appears blueish reason:we miss uv cones.
I actually just purchased the 502b AND a 9 uv led and they both aren't very useful for detecting fake IDs and cash... I spent about $15 for just the 502b bulb and it's wavelength is 390-400. Try shining it on an ID with uv markings, it'll still light up the markings, just not very well. The "Urine off" UV led tends to light up every uv hidden item on the IDs as well as cash. Most of the WF501B's light is white light because it's at the end of the wavelength spectrum. Bright doesn't equal useful.
thelogical22 7 months ago
Sorry but 410nm is not colled uv anymore
from 400nm up is called the blue spectrum and stimulates the blu cones and strangely also a little bit the red cones in the eye and creating an purpleblue also called violet color. Because we don't have cones for UV we can't see the real color of UV also the lens in the human eye blocks UV making the UV can't reach
the retina in the eye.People that have undergown cataract surgery mostly can see UV but to them it appears blueish reason:we miss uv cones.
kopjesenseo 1 year ago
Since this is U.V. light about the same nm as a bluray laser diode will it burn, if you use a magnifing glass to focus it to a point?
laser74hobby 1 year ago
lol i,ts good xD
fabian789445 2 years ago
410nm is too high :-( I hope that they will sell 375-390nm one day.
thePavuk 2 years ago
i was about to post the same comment omg!
you posted this 4months ago -_-
griptick 1 year ago
do this on a twenty dollar bill
DAKODA65 4 years ago
yes in every bill
10GreenDay01 2 years ago
Hi, were you get this UV Led??? How much you paid for it and the big one is a 10watts or 20watts???
changchung 4 years ago