Smartphone Blacklight, can this be done on a flashlight?

hyperloop · Jul 31, 2015

Hi there, I saw this video on youtube and was quite astounded, not having any science or engineering background, I came to CPF to ask, could this be done with one of the LED flashlights, of course, the simplest solution would be to try, but that means I have to go buy Sharpies (it's 1.47 a.m. here so Sharpies are out).

iPhone Blacklight

FRITZHID · Jul 31, 2015

No. All that is, is a cheap way to make a dim, purple light.
There isn't enough (if any) actual if UV light coming from the LED it self to be converted into a blacklight....by any means of filter, or otherwise.

Str8stroke · Jul 31, 2015

I saw that video, then I tried it on a old phone. It didn't work for me. But give it a go and keep us posted.

lunas · Jul 31, 2015

this just filters it to a purple wave i would have like to see a spectrograph of the light that comes out of it with the 2 blue and purple filters

lightfooted · Aug 3, 2015

I dunno, maybe the LED on the iPhone is really crappy and actually does emit some UV light that could be filtered...but near UV light can still cause things to glow a bit. Even a nice blue LED can do that.

Smartphone Blacklight, can this be done on a flashlight?

hyperloop

Flashlight Enthusiast

FRITZHID

Flashlight Enthusiast

Str8stroke

Flashlight Enthusiast

lunas

Enlightened

lightfooted

Flashlight Enthusiast

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