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Cheap UV LED flashlights for outdoor UV?

Lighting
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#1 montanawildlives

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Posted 15 June 2021 - 13:23

Does anybody successfully use those cheap (~$20) UV LED flashlights with maybe 20 individual LEDs to throw a little extra light on flowers or insects when taking UV pics outdoors? Is this a reasonable way to get faster shutter speeds? I'm asking because I am finding it nearly impossible to do outdoor shots without long shutter speeds (~1 second, even with danger-level ISOs).

Are LED UV lights potentially harmful to insects in the same way that the stronger (real) UV lights could be?

Thanks.

#2 UlfW

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Posted 15 June 2021 - 13:35

Not often, as the colours are very limited due to the rather narrow spectrum fro the LED.
https://www.ultravio...__fromsearch__1
The Convoy S2 is a strong single LED torch we used those days.

I later discovered a more powerful torch that in the forum was named Nemo:
https://www.ultravio...hallenger-nemo/
That might be useable for you.

It is current hungry and need to be run on freshly charged good quality batteries for a reasonable output.
The intensity decays when the battery voltage gets under 3.7V when loaded.
Ulf Wilhelmson
Curious and trying to see the invisible.

#3 UlfW

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Posted 15 June 2021 - 14:22

One thing to remember is that the intensity from a torch decreases to 1/4 when the distance is doubled. (the inverse square rule)
High intensity is only possible at short range and then the light spot is not that big.

Edited by UlfW, 15 June 2021 - 14:22.

Ulf Wilhelmson
Curious and trying to see the invisible.