5 Watt UV A, B & C Light

[colinbm]

5 Watt UV A, B & C Light

This UVC light uses a thin film to filter for UV A & B from the UVC light.

What are these films & where can I get some Please ?

 

https://www.ebay.com.au/itm/Way-Too-Cool-5-Watt-THE-TRIPLE-Shortwave-Midwave-Longwave-UV-Light-w-HOYA/143848385729?_trksid=p2485497.m4902.l9144

 

 

[dabateman]

The thin film is a 1mm thick Zwb3 glass or sometimes uv grade PMMA with similar elemental chemistry, to make it more flexible. They really don't block visible well. But if the source is a very low pressure Mercury bulb, then most of the light is 254nm, so its kind of ok.

 

I am playing with 6mm to 9mm zwb3 glass over a germacidal 254nm bulb to block all visible light and still only have UV and some IR. Should be fun.

[StephanN]

Doesn't it say "Way Too Cool". and searching brings up this: https://www.fluorescents.com/ . This company will make these films, I suppose.

[dabateman]

The Ebay ad claims this:

UV Filter: 2-3/4" x 1-3/8" x 4.5mm thick Genuine Hoya U-325C Filter

 

If that is correct, then that is what you are paying the $150 for. Its only 5W claim for UVC, at this size then it would be using these bulbs:

 

https://www.ebay.com/itm/3-UVC-Ultraviolet-Germicidal-Disinfection-Sterilization-Lamp-Quartz-Light-Bulb-/392739706402?_trksid=p2349624.m46890.l49292

 

They are okish but not great. I have a couple and have blown up 3. They are very sensitive to input voltage.

 

Maybe I am wrong about the bulb the way too cool diagram indicates a bulb like this:

https://www.ebay.com/itm/REPLACEMENT-BULB-FOR-GE-GBX5-UVC-G23-5W-/153691850223?_trksid=p2349624.m46890.l49292

 

Still its a germacidal bulb with UV leak. Not a bad claim my 15W UVC bulbs behind 3mm ptfe has a broad UV output.

 

The Hoya 4.5mm U325C looks like 3mm Zwb3 glass sheets that I got from china.

[ulf]

The thin film is a 1mm thick Zwb3 glass or sometimes uv grade PMMA with similar elemental chemistry, to make it more flexible.

I don't think that is correct.

The thin films with embossed M and L are some fluorescing material to transpose the lamp's UV-C to either UV-B or UV-A, just as the coating inside normal fluorescent tubes, but with a different wavelength.

They are sold separately too:

https://www.ebay.com.au/itm/Way-Too-Cool-Midwave-Longwave-Ultraviolet-Phosphor-Sheets-for-5-W-The-Triple/133416929466?hash=item1f1044c8ba:g:B4sAAOSwsNZexxKu

[dabateman]

Ok I am at fault for not reading the question.

I am too fixated on making filters tonight.

 

Ulf is correct, that thin film (since there are two, one for each wavelength) must be a phosphor coated sheet that glows to UVB or UVA upon UVC excitation.

 

Thats how my 302nm bulb works with a germacidal bulb and coatings inside the glass to get to 302nm. For 365nm its better to just use a higher pressure bulb. Much more efficient.

[colinbm]

Thanks every one,

The mineral fluorescent people talk in SW, MW, & LW for UVC, UVB & UVA

I have seen these examples of the three wavelengths on the same mineral.....