Hi guys. As title says, any cheap UV Flashlight to detect/test sunglasses UV protection if that is even possible? Any AAA/AA format will do and runtime is absolutely not of any importance nor is throw or multi mode or anything fancy. As long as it is cheap, turns on and off and will fill the above requirement, Iām fine
I just want to make sure that the sunglasses I will be purchasing will be effective in blocking UV.
It has a load more power than a led, it has a wavelength range from 300-400nm, so it gives more information than just for one wavelength, with copier paper (=bleached, so will fluorescence) behind the glasses you can check if any significant uv is transmitted.
Seriously, I think any optometrist these days will have a calibrated UV source.
If not, think twice ā then find an opthalmologist.
My eye doctorās shop uses a UV device calibrated to verify UV is properly blocked.
Thatās because people making lenses and coatings do screw up from time to time.
Seems quite cheap too me, when compared to possible eye damage from wearing sunglasses that you donāt know if they offer uv protection or not
Curious too if their is anything more torch like available,
the strip light above seems fine, but something easier/smaller to shine through sunglasses lenses would be better ?
If you want to check for deep UV around 200nm just look at a HID street lamp out of the edge of the lens. Polycarbonate or Lexan safety lens defract the UV quite a bit. There will be a red fringe on one side of the light a blue fringe on the other side of the light. This is the near UV around 400nm that LED lights put out. There will then be a gap the same size of the light and an additional stripe of blue this the far UV around 200nm.
I donāt know if itās been mentioned before but Iāve just had a delivery from FastTech, a AA, 3 mode zoomie @365nm, what the hell they thought you need modes for - high-low-strobe - on a UV light. It fluoresces everything it should so thereās 365nm in there somewhere along with visible light. Excellent for the price. 8)
Just eyeballing them, the KD P60 is about the same using 1x18650, and the Ultrafire on AA, I contacted FastTech to see if the product description was right giving the operating voltage as 1.2v-3.6v they said yes and confirmed a 14500 could be used without blowing the LED.
With the 14500 and the lens on spread the KD P60 wins but with the lens set for throw it gives a much more concentrated beam than the KD P60. The LED Looks like itās encapsulated in a bullet shape that protrudes into the reflector when zoomed in for spread but falls back when zoomed out for throw.
For $5.36 (plus the 14500 if you donāt have one) itās a bargain.
I do know you can check for polarization by taking two sunglasses lenses one in front of the other and hold up to a light source and rotating one 90 degrees , the light transmission thru both lenses should completely go away and you will have a black view thru both lenses
For UV protection check, go to any good eye doctor or optometrist and ask them (donāt trust the cheap chains, theyāll lie to you to sell you new lenses)
A good eyeglasses shop always has a calibrated UV source and they check the lenses when they come back from the place that makes them and applies the UV coating, to make sure itās applied without any thin spots or missing areas.
Yes but blurry, not as sharp definition as some other zoomies, you can see the square shape but not at all clearly. If it zoomed out further it might be more defined, the front end only moves 6-8mm.