For comparison, check out the size of the lights versus a common pen.
These lights are really small!
Using our modified FSC-F717 infrared sensitive camera, we took a picture of the
various LED Mini lights. The violet one on the left is a 400nm ultraviolet
light. The far two lights on the right are 880nm and 940nm infrared
lights. The 880nm and 940nm lights are not visible to the human
eye. You need an infrared sensitive camera (such as NightShot camcorders)
or night vision equipment to see the light. Notice that cameras cannot
simultaneously focus on UV, visible and IR light. This is because the
wavelength affects the focal length on the lens. If you focus on IR, the
visible light won't be in focus. In this picture, we focused on the
visible white light so the UV and IR lights are not quite in focus.
Here you can see our LEDMn400 with the 400nm LED illuminating invisible
ink. Note: 400nm will illuminate most UV fluorescent inks; depending on
the ink or dye, it might not work as well as the 375nm LED or 365 fluorescent tubes. The 400nm is
less expensive than the 375nm LED unit and much smaller. The 400nm is very
well
suited for automotive leak tracing dyes which are tuned for 400nm lights. 700mcd output with peak at
400nm. This is the same LED that others rate as a 395nm LED, however,
though they are looking at the minimum frequency, not the peak.
Note: 395-400nm UV lights cost much less than 375nm UV lights. This is
because a 395-400nm LED costs about $0.20 while a 375nm LED costs about $26.00. At the moment, there is only one manufacturer in the world that
makes a 375nm. However, the 395-400nm lights don't work with as many UV
fluorescent materials or may not work as well. It depends on the
particular characteristics of the material. Our 400nm works decently with
our invisible blue and invisible red inks, but not as well as the 375nm light.
There are no commercially available UV LED's that emit below 375nm, and
certainly none at 254nm. There have been some UV LED's made in
laboratories that go below 375nm, but you can't buy them. Supposedly, in
spring of 2004 we may see some 365nm LED's.
Both the LED Mini and LED Sub-Mini lights use 3 volt Lithium BR435 batteries. The LED Sub-Mini uses one battery while the LED Mini uses two
batteries. The BR435 batteries, as you can see from the picture, are rather
small. We stock the BR435 batteries at great prices.
Please note that the 400nm LED lights don't work very well with our acetone
red ink (XPR- series). They do work very well with the invisible blues.