miniature UV flashlight powered by smartphone

DavidEF · 2019-08-28T21:02:45.000Z

Welcome to BLF!

So…

If you were to produce some of these to sell, how much do you think you’d charge for them?

Garuspik · 2019-08-28T21:07:54.000Z

DavidEF:

Welcome to BLF!

So…

If you were to produce some of these to sell, how much do you think you’d charge for them? :money_mouth_face:

20-30$ including international delivery.

DavidEF · 2019-08-28T21:11:43.000Z

Garuspik:

DavidEF:

Welcome to BLF!

So…

If you were to produce some of these to sell, how much do you think you’d charge for them? :money_mouth_face:

20-30$ including international delivery.

Including delivery, I think it is a nice price. :+1:

BlueSwordM · 2019-08-28T21:11:52.000Z

25-30$US would be a good price, especially if it includes a ZWB2 filter cut to size and shipping.

DavidEF · 2019-08-28T21:13:08.000Z

BlueSwordM, Garuspik already said why it doesn’t/won’t have ZWB2 filter a couple times.

Rdubya18 · 2019-08-28T21:20:42.000Z

Welcome , and that is very nice light you have made

Garuspik · 2019-08-28T21:21:26.000Z

Guys, please look at video - main purpose is UV flashlight for smartphone With filter you won’t take more or less decent shots from smartphone camera.
And from my point of view fluorescence is visible in almost same way with or without ZWB2 filter.

Seven4s · 2019-08-28T21:54:40.000Z

I’ll buy 2, if you’re selling now. Please contact me offlist via PM.

Garuspik · 2019-08-29T06:44:36.000Z

Seven4s:

I’ll buy 2, if you’re selling now. Please contact me offlist via PM.

No, it will not work this way. To start a production and sell them at a reasonable price I need orders for at least 250 pcs. I need to order PCBs, buy led at bulk prices (by the way one led cost about 5:money_mouth_face:, make a small injection mould for plastic case. This is a new device from scratch, not a mod of existing flashlight.
So I guess I’ll go to Kickstarter. If you think that I’m some sort of fraudster - check my previous Kickstarter project or website in my signature (especially reviews section)

djozz · 2019-08-29T08:59:09.000Z

If you think that I’m some sort of fraudster

I do not think anyone thought or said that

Rdubya18 · 2019-08-29T08:24:13.000Z

…wish stuff I made looked that good !

djozz · 2019-08-29T09:15:24.000Z

Garuspik:

Guys, please look at video - main purpose is UV flashlight for smartphone With filter you won’t take more or less decent shots from smartphone camera.
And from my point of view fluorescence is visible in almost same way with or without ZWB2 filter.

In my experience (so not an opinion), the addition of a ZWB2 filter to 365nm light from any current UV led improves the fluorescence contrast enormously, allowing users to distinguish many fluorescence details that are completely invisible without the filter. Further, the stray light from a UV-led is a particularly poor source for background illumination, if a background illumination is desired, a second white led would give better quality plus there is the option to switch it off. Or the inbuild smartphone light could be used as secondary illumination. It does complicate the design of course.

This is all a suggestion from my side to improve the design, I do not mean to say that the current design is bad, I still think it is a nice gadget as it is now.

Garuspik · 2019-08-29T09:47:43.000Z

djozz:

Garuspik:

Guys, please look at video - main purpose is UV flashlight for smartphone With filter you won’t take more or less decent shots from smartphone camera.
And from my point of view fluorescence is visible in almost same way with or without ZWB2 filter.

In my experience (so not an opinion), the addition of a ZWB2 filter to 365nm light from any current UV led improves the fluorescence contrast enormously, allowing users to distinguish many fluorescence details that are completely invisible without the filter. Further, the stray light from a UV-led is a particularly poor source for background illumination, if a background illumination is desired, a second white led would give better quality plus there is the option to switch it off. It does complicate the design of course.

I definitely a newbie in flashlight society and don’t have big experience but I’ve experimented with several 1w IR leds and there were such that show almost the same result with and without ZWB2 filter. And there were such that differs dramatically. The most expensive one (like Nichia for example) had almost no benefits.
What I see on BLF from your own topic proves my opinion also:
Test of ZWB2 filter

Optosupply leds behave in the same way.

djozz · 2019-08-29T09:57:08.000Z

I have never had any Optosupply leds, if they emit as little visible stray light as Nichia 365nm leds, the ZWB2 filter makes less difference but would still help significantly for enhancing fluorescence contrast (as stated in my ZWB2 filter post). One thing to consider is that at least my experience with the Nichia 276A U365 led is that over time the visible stray light increases, making a filter more useful. But that may be more relevant for a heavy-use forensic flashlight than for a smartphone add-on for occasional use.

Garuspik · 2019-08-29T11:37:52.000Z

Absolutely agree. That’s not a pro tool and never intended to be. I’ve designed it for occasional use for those who want to check whether plates in restaurant or linens in hotel are clean.

For some reason insertion of video in previous post failed.

djozz · 2019-08-29T12:32:44.000Z

A tip for making a video: digital camera’s pick up light further into the UV than your eyes, so there is a purple haze in the video that you do not see in reality. You can filter out the purpe haze with a UV-blocking filter before the camera lens. Polycarbonate protection goggles for example work well as a blocking filter.

EDCba · 2019-08-29T12:39:09.000Z

Very interesting. How does it compare with Tube UV?

Garuspik:

Seven4s:

I’ll buy 2, if you’re selling now. Please contact me offlist via PM.

No, it will not work this way. To start a production and sell them at a reasonable price I need orders for at least 250 pcs. I need to order PCBs, buy led at bulk prices (by the way one led cost about 5:money_mouth_face:, make a small injection mould for plastic case. This is a new device from scratch, not a mod of existing flashlight.
So I guess I’ll go to Kickstarter. If you think that I’m some sort of fraudster - check my previous Kickstarter project or website in my signature (especially reviews section)

There’s already a KS for something like this: https://www.kickstarter.com/projects/1070855717/multiwavelength-uv-flashight-for-travelers-and-pho

Garuspik · 2019-08-29T13:01:54.000Z

EDCba:

There’s already a KS for something like this: https://www.kickstarter.com/projects/1070855717/multiwavelength-uv-flashight-for-travelers-and-pho

Yeah, I know. But from my point of view mine has absolutely another form-factor.

How it compares with tube uv? It compares like sun and alpha centauri when looking from earth in daytime. I’ll show video later.

wle · 2019-08-29T13:29:27.000Z

Garuspik:

Brief explanation why everyone who want to keep his house clean need UV flashlight. Everything is recorded with smartphone\ smartphone with attached flashlight.

https://www.youtube.com/watch?v=Cfm0avfkRt4

but a lot of dirt, germs and gunk, do not glow under UV

and some of the things that do are not problems - like laundry whiteners, bright blue under UV

wle · 2019-08-29T13:29:58.000Z

i would put that on a 1 meter cord, or at least add an extension cord

wle