More Tests of UV LED flashlights and LED's
we do some additional tests with both the spectrograph and direct
lighting of UV mineral specimens. The newest addition to the
UV light line up is the just completed 9 LED mineral lamp I built
this week, seen below as the small black box in the lower left
corner of the test bench. The results are good - a strong performance
on long wave UV minerals!|
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Left: Bench setup
includes the huge 100 LED scorpion killer flashlight on the upper
left, in the pin vise pointing at spectrograph input is the "Purple
LED flashlight" which is an original scorpion lamp sold
many years ago when the first came out. Then the blue flashlight
is a standard 27 LED white lamp used for full spectrum views.
Finally the new
unit is the black box in the lower left, which is 9 Adafruit
UV LED's I put in a housing with a 9v battery and switch.
is in center, and laptop is recording short 100 frame AVI files
of each spectrum for low noise integrations.
The Big compare.
Click to enlarge to full size.
The results show
that the old Purple LED light was not as far into the UV as the
two newer units below it. I drew a straight edge on the images
so you can see this. The Adafruit LEDs are apparently identical
to the ones used (as far as pass band) in the 100 LED scorpion
Finally, a solar
spectrum is aligned on the bottom to show the relative positions
of the UV outputs vs visible light. Second order spectrums have
been cropped off, as the UV lines appear again superimposed on
the IR data...
Left: now in the
old photo dark room, I set up to show what each lamp did at a
distance of 10 inches and the same photographic exposure - 1/500
f/5.6. This is the white light room light on view of the test
On the left is
a chunk of calcite that glows a bit white under long wave UV,
and on the right is a specimen of hyalite opal that is very active
in long wave.
here is with the 100 LED lamp - fills both samples with a huge
4 inch beam. The Hyalite is glowing blue, but the calcite is
9 LED has same intensity as the 100 LED, but over a smaller 2
inch area. Still, a very nice performance!|
old purple 5 LED scorpion lamp? Sorry, time for retirement!|