Wurkkos WK30 with UV395 vs Wurkkos WK30 with UV365 LED comparison

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d_t_a
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Wurkkos WK30 with UV395 vs Wurkkos WK30 with UV365 LED comparison

Got my hands on a new Wurkkos WK30 which comes with the UV365 LED.

Did some comparison shots..

 

left: UV395 ;  right: UV365

 

(side comment: the UV365 LED seems to have a fair amount of visible white light, but it appears to be UV365, similar to Convoy S2 with LG UV365)

 

zoom in (UV395)

 

zoom in (UV365)

 

sample shots on our currency:

 

left bill has the WK30 (UV395), while right bill has the WK30 (UV365)

 

 

now reverse:

left bill has the WK30 (UV365) ; right bill has the WK30 (UV395)

~~~~

 

have done a short video (3 minutes, no audio commentary) with the Wurkkos WK30 (UV395) vs Wurkkos (UV365) vs Convoy S2+ (Nichia UV365 + ZWB2 filter)

 (text commentary: 1st flashlight tested on the bills is the WK30 UV395, 2nd flashlight tested is the WK30 UV365, and the 3rd flashlight is the S2+ (Nichia UV365 with ZWB2 filter)

 (on the later half of the video, 2 flashlights are used at the same time to show the difference)

 

 

Edited by: d_t_a on 06/21/2020 - 09:51
jimahi
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Thanks for your comparison! It looks like you can easily see a difference on the surface die pattern of the different UV emitters. It looks like the one I got from Amazon US has the new 365 emitter. Unfortunately, the red and UV emitters are horribly off center. The white one isn’t as bad. Yours looks a lot more centered.

Scientist
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Thanks for the nice comparison. A couple of comments. The 395nm led has enough emission in the visible that you see a lot of purple light. Wearing yellow filter glasses when using this is helpful for two reasons. One is too filter out the purple light so you can see the fluorescence better. The second is to protect your eyes from reflected UV. A lot of the whitish light you see from the 365nm led is actually fluorescence of various things. Best to wear protective glasses with this one too, although I would use clear lenses.

d_t_a
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Scientist wrote:
Thanks for the nice comparison. A couple of comments. The 395nm led has enough emission in the visible that you see a lot of purple light. Wearing yellow filter glasses when using this is helpful for two reasons. One is too filter out the purple light so you can see the fluorescence better. The second is to protect your eyes from reflected UV. A lot of the whitish light you see from the 365nm led is actually fluorescence of various things. Best to wear protective glasses with this one too, although I would use clear lenses.

Thanks for the advice!

So if I understand correctly, yellow-tint polarized “anti-glare” glass works best for UV395 (purple tint)
while clear polarized glasses will work for UV365…

I have a question, since I wear prescription eyeglasses (nearsightedness + astigmatism) and assuming the eyeglass is “photochromic” (darkens with UV), is this good enough for UV395/UV365?
(I understand it takes a bit of time, several seconds, for the “photochromic” glass to darken with UV, but I think the eyeglasses are ‘polarized’, so it offers protection against UV (UV395 or UV365) — would that be correct?

Lightbringer
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In the dark, shine the UV light at anything that fluoresces. Then stick the lens in front of the light. If the thing still fluoresces, the lens is no good. If the thing doesn’t fluoresce anymore, the lens is good.

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d_t_a wrote:
Thanks for the advice!

So if I understand correctly, yellow-tint polarized “anti-glare” glass works best for UV395 (purple tint)
while clear polarized glasses will work for UV365…

I have a question, since I wear prescription eyeglasses (nearsightedness + astigmatism) and assuming the eyeglass is “photochromic” (darkens with UV), is this good enough for UV395/UV365?
(I understand it takes a bit of time, several seconds, for the “photochromic” glass to darken with UV, but I think the eyeglasses are ‘polarized’, so it offers protection against UV (UV395 or UV365) — would that be correct?

Just to be clear, I was suggesting wearing yellow filter glasses when using the 395nm led, not using a filter on the flashlight. The use of photochromic glasses with UV is unfamiliar to me, however I would suggest that anything that darkens will just make the fluorescence you want to observe dimmer. However if they darken they should absorb the UV and protect your eyes. As Lightbringer has suggested just try shining the beam through the glasses and see if it passes through. You usually don’t need the yellow filter glasses for 365nm use, as there is much less purple light.

Boro
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Lightbringer wrote:
In the dark, shine the UV light at anything that fluoresces. Then stick the lens in front of the light. If the thing still fluoresces, the lens is no good. If the thing doesn’t fluoresce anymore, the lens is good.

Helpful tip, thanks.