Source for UVB (293-298nm) LEDs?

Really appreciate it, guys!

LED295W - 295 nm LED with Window, 1.2 mW

https://www.thorlabs.com/thorproduct.cfm?partnumber=LED295W

$214.21 each. Ouch.

I was hoping that would be a pack of 10 or 100.

Why are UV LEDs so expensive?

UV LEDs for anything below 365nm are very new and specialized, so older technologies may be cheaper if you can adapt the power source and reflector.

If you’re on a budget, you could try a UV-B fluroescent tube and suitable filter.

I saw that Kaidomain has some 310nm at a very attractive price. Unfortunately, that’s outside of my range, and that 10nm difference makes the light about 8x less useful to my application.

I’ll consider the tubes option. Any suggestions on where to look for tubes and filters? This isn’t my area of expertise.

If you’re wanting this for Vitamin D purposes, may I politely encourage you to drop it straight away. Unless something very recent has been published, the work on this was done I think 5 years ago or more, and it was never tested on live human skin. Remember that UVB is quite the contributor to serious cancers and skin conditions (not to mention eyes) and it penetrates very quickly through the dermis. What you get outdoors is safe enough and effective in a short enough amount of time that sun exposure should not be a problem for the majority of people.

Snooped around a little because I was curious (I’ve been waiting patiently for some good germicidal UVC emitters for backcountry water treatment that don’t need a ton of power or aren’t so large and fragile as to be totally impractical). Most of the big guys aren’t offering midwave emitters at all…wonder why. But I did copy this passage from part of a research paper (I think this may have been the one out of the small handful that were published which gained traction in the….“supplement industry” and bastardized before being spread around as fact). I don’t imagine any of these are inexpensive if you can even get samples from them. I can’t remember the name of the German emitter manufacturer but it’s possible they’d have one (and if I remember, like almost everything they had was super expensive anyway, even basic whites).

“The 293 nm LED was obtained from RayVio (Hayward, CA, USA), 295 nm and 305 nm was from Sensor Electronic Technology, Inc (SETi, Columbia, SC, USA), and 298 nm was from DOWA Electronic Materials Company, Ltd (Chiyoda-Ku, Tokyo, Japan). The LEDs were powered with a power supply (supplied by RayVio) set to 50 V and 10 mA for all the experiments.”

Note the power feed info. The majority of the UVC emitters need a lot of power while being very sensitive to both heat and overpowering them…not difficult to fry ’em and I don’t think any off the shelf flashlight drivers would be suitable, whereas some are fine for our UVA emitters.

Speaking of Vitamin D, I don't get enough sun, so I take a Vitamin D pill daily.

Good morning and thank you @correllux I actually found the stream because I too am seeking this light however I am seeking for Vitamin D purposes so really thank you for expounding on your thoughts in this area. It’s new research to me and I know that there has to be some race correlation to it because I am half African-American, I work out regularly outdoors because that’s my preferred method and as a training Naturopathic doctor I am well aware of the goodness of the sun and saying that, I focus on actually sitting in the sun a bit with the intention of gathering the Vitamin D so when I did lasts years studies of my own health the only issue is my minimal Vitamin D ratings and mind you I eat a very healthy diet so I’m eating as much vitamin D as I can and although aside from lack of vitamin D the only medical issues that I have is a neurological disorder which is what led me to finding alternative ways to build up my Vitamin D because taking just a general Vitamin D pill has done nothing for my levels so thank you again for sharing your thoughts on this and I am sadly I do agree with you that Research is still new not 100% confirmed and it’s gonna continue to be high cost I think until more companies are involved because this sadly the spore is not a tool did the average individual can build out to use.

Ty!

This one maybe

Greetings! There indeed is a lot of info regarding how UVB light causes cancer. I read it increases probability by 75% relatively which absolutely still is well below 1% and I believe this method of obtaining vitamin D can be used safely, after all, light is just light regardless of its source, isn’t it? (don’t use it as regular light pls)
I’ve found some Chinese guys who produce 293nm LEDs and sell for almost nothing (but I think you will need a few to get significant results) and am willing to share the link!

As you can see there are a few in the same lot, I think you simply should specify which model you want. I even enquired them saying that I want to buy a few hundreds (I do not) and got a catalogue with technical sheet of the 293nm model. And I am sharing!

The wavelength range is very narrow!
Please tell me if you try these lamps because even if I decide to, it will only happen in a few months!

I sell in ebay 295 nanometer lamp. 1 watt $60 4 watt $80 8 watt $100 and 20 watt $200. The price include the power supply, timer and UVB blocking glasses.

Vitamin D pills are not good because they are not vitamin D3. The D3 is not stable and does not come in the form of pills or other form. There are different molecules that are close to vitamin D3. The producers write that they are better because they are stable but this is not true. The practical result is that they do not help in any skin diseases. While LED lamps of 295 nanometer cure skin diseases very fast.

I actually went to my doctor yesterday for my annual wellness check.
My Vitamin D3 levels were excellent even though I get extremely little sun.
How is that physically possible without me taking my Vitamin D3 pills (which I definitely do take)? :thinking:
Also, it was my doctor’s idea to take Vitamin D3 pills and she told me to keep on taking them because I get so little sun.
Do you know more about Vitamin D3 pills than my doctor? :thinking:

The body of some people changes the vitamin D2 to D3 and others don’t. There are no vitamin d3 pills. They write D3 but it is a different molecule. When there is a chronic skin disease, the normal Vitamin d3 is not enough to fight the cause of the diseases. That is why a Vitamin d3 lamp will boost the vitamin in the treated area, and it will strengthen the immune system in that skin, and heal the chronic skin disease. You have any skin disease? What is your purpose to get a LED vitamin D3 lamp? The prices are much lower. But a LED chip is not enough, you need the suitable power supply and means to cool the chips.

1 Thank

Okay, fair enough, but you said that “Vitamin D pills are not good because they are not vitamin D3” but Vitamin D pills are good for many people.
I don’t have skin disease, and my immune system is very good, so why would I need a Vitamin D3 lamp?

If your vitamin D3 level is normal I don’t see a reason to take the pills. The price of the lamps dropped much. 2 years ago a 1 watt lamp gave 1 milli watt of light, and now it gives 50 milliwatt. 2 years ago 1 kilowatt cost $200 and now the price is 0.1-1$ per mili watt.

The only reason my D3 levels are normal is because I take the pills. :+1:
I can tell that your judgment is clouded because you have a direct financial interest in the subject.
Also, you’re really good at NOT directly answering EVERY question that I ask.
(My doctor doesn’t do that.)
I’ll continue getting my health advice from my doctor, and from internet searches, NOT from a light salesman.
I realize your product is helpful to some people, but not to everyone.
It would help you if you were more honest with your approach, instead of just SELL SELL SELL. :smile:

You wrote that you don’t take the pills. And I was a manager of a UVB clinic 20 years and have many patents on lamps and phototherapy. Anyway, goodby, try not to offend.

Nope, I think you misunderstood my post. :stuck_out_tongue:
I have said repeatedly that I DO take the pills. :thinking:
(I changed one of my posts above to make that more clear.)
Good day to you, too. :+1:
I think it’s best if we quit this discussion before it becomes an argument. :upside_down_face: