Awesome! Fun to see that you got the Quantadose ones that I suggested in the previous video. I got them as well, but I haven't still tested my UVC Philips tube lights.. just gotta wire the ballasts up.. but I never get around to do that :P hehe.. Great video as always!
@madcalm2024
Жыл бұрын
Tube lamps degrade very quickly on each switching on, which makes their maintenance equipment a headache
@madcalm2024
Жыл бұрын
As to light & microbe killing effectivity %, tube lamps also emit alot (most of their spectre) of non UVC photons - green, red etc
@littlechestnutorchard
3 жыл бұрын
When I was a kid many many moons ago I used to experiment with mercury discharge street lights , if you break the outside borosilicate glass bulb the inner fused quartz silica arc tube emits powerful 400W wide band UV lights 365nm UVA 254nm UVC 184nm UVC Also produce intense ozone gas. This was happening 40 odd years ago and I blinded myself couple of times and pain was excruciating, luckily did not cause long term damage .
@andymouse
3 жыл бұрын
Lucky !
@Basement-Science
3 жыл бұрын
Yeah dont forget about the sunburn as well. And the exposed electrical connections. And risk of explosion. They are pretty dangerous all around.
@sdgelectronics
3 жыл бұрын
I vaguely recall there might be something similar to this on bigclive's website from 15+ years ago. A simple ozone generator made from streetlight components.
@piconano
3 жыл бұрын
The problem is these also produce lots of ozone at ~280nm. The types with regular glass enclosure instead of quartz glass, don't produce much ozone, but are weaker when it comes to germ killing. At the beginning of the pandemic, I wanted to build a breather mask using the same concept as a muffler, to make the air pass through, while being radiated at the entrance with UVC, but don't pass any light. I quickly discovered how much ozone it will produce, and gave up on the idea.
@chuckvanderbildt
3 жыл бұрын
280nm won't produce any ozone, wavelength isn't short enough.
@Basement-Science
3 жыл бұрын
@@chuckvanderbildt Exactly, I think you need around 180nm or lower to produce any ozone. Even the discharge lamps only produce very little of that wavelemgth and it can easily be filtered out by a coating on the glass.
@sdgelectronics
3 жыл бұрын
I couldn't detect any ozone from these, so I think you're safe from that aspect.
@hullinstruments
3 жыл бұрын
Has to be quartz or sapphire glass because UVC light will quickly degrade and destroy plastic or other LED materials. Therefore making it cloudy, build up more heat…and after only a few hours use it would be totally unusable.
@Kinoko314
Жыл бұрын
I really wanted to see you turn on the UVA and UVC LED that were on the same chip AT THE SAME TIME. Would the "UVC" letters appear white instead of green? I have a product that is supposedly UVC, and I get white "UVC" letters. The light the LEDs emit looks incredibly purple/magenta, and I am trying to figure out what is really going on. Each individual LED causes this result. Any thoughts?
@led525
Жыл бұрын
This quantadose card does not distinguish uvb and uvc. It shows even uvb 310nm shows UVC letter.
@LutzSchafer
3 жыл бұрын
Thank you for the followup :)
@disinitalldisinfectitallwi7658
3 жыл бұрын
The Luminus UVC LEDs are really nice.
@TheChemicalWorkshop
3 жыл бұрын
to ship a card like this costs 20$ anyone got cheaper alternative for the uvc detection card?
@tinygriffy
3 жыл бұрын
Very conclusive, thanks !!
@TradieTrev
3 жыл бұрын
You can't compete with a gas filled tube in regards to surface area, although I could imagine with the right lenses and enough of them you kill heaps of germs. I'd love the R&D work that you do, I can see these leds being useful in wastewater management but the future will tell what will become an industrial standard.
@sdgelectronics
3 жыл бұрын
I think lenses might be difficult to implement however - UV-C is likely to damage anything other than a quartz lens
@extendedp1
3 жыл бұрын
Thanks for the video, I will check out your other UVC videos as I have been into UVC as a means of disinfection way before COVID hit. I was never sure how to verify my bulbs were working properly, and at what strength, so this was helpful. My big question is... How do we know these inexpensive Quantadose cards are accurate? Have you done any tests on these cards vs a UVC meter, or know of anyone that has? THANKS.
@hullinstruments
3 жыл бұрын
Pretty positive a bunch of people in the laser, optics, and light building community have tested them with known UVC sources. Places like the laser pointer for him, or the budget like forum.Using proper spectrometers and equipment. I would think it would be pretty easy to do this with no special equipment. Just test various light sources you have, some UVC, some UVB, and even just plain purple light at about 450 nm. if the UVC writing still shows up with any other light sources… Then you know it’s not working. But I’m pretty damn sure these work fine. Hundreds of Amazon reviews and people all and folks over the lighting forms have messed with them extensively. It would be really easy to figure out if they do what they’re supposed to, with the regular stuff you have around your house, in the process of elimination
@extendedp1
3 жыл бұрын
@@hullinstruments cool, thanks for the info
@VMFRD
3 жыл бұрын
For pond or aquarium water sterilization or even to kill algae this source of UV-C is still far away from being any good. In my 1500L pond I use a 15W gas filled tube. It is still 1W per 100L so imagine how many LEDs you will need even for a small aquarium...
@dreamcat4
3 жыл бұрын
Please correct me if i'm wrong. but i would maybe expect a solid state semiconductor device like this to be more reliable than a discharge tube. well if they can make it right, because as we know uvc itself is very capable of degrading many plastics or filter material which must be constructed over the led die. But for a mobile application for example in a vehicle which has a lot of vibrations. Or temperature variations and it is not easy to swap or replace the lamp if it fails. And if the cost is no object. Then maybe these things makes enough sense so long as that mobile platform can provide enough cooling to how many of them is required. And if they are not hitting a brick walls, and can still continue to gradually increase the efficiency. For future products. Then i would imagine these could be attractive for niche military and aerospace application. Like the mars rover. Lots of vibrations during takeoff. Then all those many different science experiments etc. For example if they need to shine a low intensity uv reference light. To test that a sensor is calibrated properly, and still working. Stuff like that. Also wonder if are any other disadvantages to the discharge lamps. Which they would hope to solve by developing leds. Like idk if the things are pulsing / flashing like a florescent light. And they want to get rid of the flicker. Or if the discharge lamp is harder to mass produce at scale. I do also wonder how far a distance the uvc penetrates the air too. At least for the 222nm far uvc. If that somehow limits the usefulness of a higher power output lamp. Isnt it that some types of uv light creates ozone from the air? That would then become a factor that absorbs some of the uv energy. Cant remember now. Depends on the wavelength i guess.
@jaro6985
3 жыл бұрын
Sure its more reliable than a UV bulb, and would last longer (both devices intensity drops over time). But it is not so hard to add a photodiode sensor to detect the bulb output. So you can have a simple "need to replace bulb" indicator. UV bulbs are relatively cheap for their output. The only major advantage for LED is size.
@sdgelectronics
3 жыл бұрын
Possibly more reliable, but most discharge tubes will last many thousands of hours, even longer with no phosphor to degrade. Robust is probably a better term.
@kwinzman
3 жыл бұрын
You teased, but then never showed the "HardKing" test cards. Are they any good?
@sdgelectronics
3 жыл бұрын
I actually forgot to test them. A quick inspection shows they work quite well and the numbers seem to align with my basic check against the quantadose cards.
@andreiciora2765
3 жыл бұрын
@@sdgelectronics you can make a video and show as your vavorite tool.
@kwinzman
3 жыл бұрын
@@sdgelectronics Thanks for the followup!
@kwinzman
3 жыл бұрын
I just got the HardKing testcards delivered. I tested them with those classic small battery powered UV-C discharge lamps where you can clearly smell the ozone after use so it's legit. (link in next comment). But the test cards showed UVA+B but not the faintest UVC. Maybe those lights are not strong enough? Or the test card doesn't work.
@kwinzman
3 жыл бұрын
www.amazon.de/-/en/Media-Tech-Steriliser-Disinfection-Elimination-Formaldehyde/dp/B07RNGJD45 or www.aliexpress.com/item/4000835475092.html (but available from many sources)
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