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OfflineDesolus
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Registered: 11/13/17
Posts: 159
Last seen: 2 years, 8 months
Another hairbrained idea I'm actually going to build... UVC maglight... * 1
    #25744054 - 01/14/19 04:51 PM (5 years, 15 days ago)

So I've worked out the rough idea for this project.

Gut a poor defenseless maglight
Install lithium ion batteries and hack a charger into the screw cap.
Install voltage regulator circuit in-between battery and connect bulb receptical to the conditioned power.
Drill out the reflector to host toothbrush sterilization bulbs.
Glue PTFE sheet on to the reflector (PTFE is 95% uvc reflective)
Cut quartz glass to replace the plastic lense and glue in place.

And Bam, maglight of make your enemies smell like burnt pork.


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Invisiblekoraks
Registered: 06/02/03
Posts: 26,670
Re: Another hairbrained idea I'm actually going to build... UVC maglight... [Re: Desolus]
    #25746838 - 01/16/19 04:57 AM (5 years, 13 days ago)

Sounds like a great idea if you want to run the risk of inducing cataract and skin cancer.

Does your plan/application involve focusing the light? If so, how are you going to do that? Your current design will result in a fairly diffuse light source. UVC is a bit tricky to focus and I'm not sure if appropriate off-the-shelf quartz glass lenses are available that will fit your purpose.

How will you deal with the heat issue, since UV-C LEDs have an efficiency of only about 5%?

What are you trying to achieve in the first place?


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OfflineDesolus
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Registered: 11/13/17
Posts: 159
Last seen: 2 years, 8 months
Re: Another hairbrained idea I'm actually going to build... UVC maglight... [Re: koraks]
    #25746995 - 01/16/19 07:11 AM (5 years, 13 days ago)

I'm trying to achieve a UVC flashlight. For no reason that has any basis in practicality.

I'm not using uvc LEDs. Instead a 3w bulb that goes in a toothbrush holder. If I was using LEDs I would have specified a constant amp controller not CV.

As for the heat issue, #1 the bulb goes into a plastic toothbrush holder... #2 I have a small machine shop and a ton of aluminum drops.

For the quartz glass, if all else fails I can use actual quartz, I have lapidary machine tools as well as a large collection of quartz in 5gal buckets.

As for focus, all I've got is a PTFE reflector. Do you have any better ideas?


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Invisiblekoraks
Registered: 06/02/03
Posts: 26,670
Re: Another hairbrained idea I'm actually going to build... UVC maglight... [Re: Desolus]
    #25747313 - 01/16/19 11:45 AM (5 years, 13 days ago)

If the reflector is all that you're going to use for focus, just leave out the quartz glass. It's of not much use anyway - unless you want to put it on for protection of the bulb of course.

Btw, 'voltage regulator circuit' is not a very specific term. It might mean any kind of power supply using a VR. As you know, something like an LM317, 7805/7812 etc. can easily be rigged (and often is) as a CCS. Hence my assumption you used a LED. Anyway, doesn't matter.

In terms of better ideas - nope; you said yourself it's a project without a practical purpose, so there's not much to optimize. Lacking a purpose, any outcome would be fine.


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OfflineDesolus
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Registered: 11/13/17
Posts: 159
Last seen: 2 years, 8 months
Re: Another hairbrained idea I'm actually going to build... UVC maglight... [Re: koraks]
    #25747537 - 01/16/19 02:11 PM (5 years, 13 days ago)

Your assumption is correct that the glass is simply to protect the bulb. Though that does give me an idea... I could cut the glass into a focusing lense, I have the software to design one.

This project is what I'm going to work on after I finish milling the PCB for my LED grow pannel. I'm using a 1 inch thick aluminum heatsink with holes tapped on one side for 20mm fans, the pannel size is odd, 4x7 inches, which is why I'm making it myself. I have the Gcode written, I just need to find the time...


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