670nm deep red led helps eyesight

I think that’s excessively dismissive. 24 people limits the statistical sensitivity of the study severely, but that’s not unusual. A lot of research starts with small initial studies like this to see if there is any indication whether or not a hypothesis is worth funding more extensive research on. I suspect this specific study was inspired by some other research into deep red light exposure effects on mitochondrial activity elsewhere in the body.

However, this is only a cross sectional study that, although randomized, has no control group.

Everyone should note that this means the research is very preliminary. The FDA would never approve a listed treatment based on this minimal level of research, for example, and it would be illegal in the US to market deep red flashlights as a treatment for visual decline until it has been thoroughly vetted.

It remains to be seen if the effect can be consistently replicated, especially versus control groups (it probably won’t be possible to use a blinded case-control study, though). Before it could be approved as a prescribed treatment, it would have to demonstrate long-term efficacy and safety. We wouldn’t want to start everyone doing this as they age without testing, for example, whether there are side effects like a temporary improvement followed by accelerated decline (ie - do we make the candle burn twice as bright, but half as long?).

Personally, I’m puzzled by what would drive this affect that is unique. Sunlight, for example, even though it peaks at around 500 nm, still has a high relative intensity at 670nm (link to PSD graph, not adjusted for luminosity function). It seems odd to me that moderate intensity red in isolation would have a significantly greater effect than high intensity red as a component of direct sunlight or even incandescent light.

i have several deep red lights, it worth a try, thou i never seen 670nm deep red, cree and luxeon only make 660nm

the op article said longer wavelengths, there is 740nm aka far red led, i wonder if it’ll work better.

no?? google aspartame, and how it was approved.

I bought some XP-E Red Led on the past.
They can be use on old Sk58/68 boost AA driver?

What is the purpose of that white thing placed over the flashlight head?

I suspect a spacer for consistency, so that everybody participating held the light the same distance from their eye for equal beam intensity.

thanks for your post and for sharing info

I wonder if going outside, and with eyes closed letting the sun shine on my face and eyelids, would produce similar benefits as an LED…

I wonder how we can measure and compare Red light sources, so we know their relative power levels.

I dont know enough yet if One Sofirn AAA light with Red LED can have comparable benefits as one of those multi LED arrays… when the goal is specifically to illuminate a small target… even just One Eye at a time…

more info needed regarding exposure time also, relative to the number of LEDs… and comparing that to using Sunlight as a source of red… (IF that is even a viable option)

I noticed this too, Declining eyesight improved by looking at deep red light -- ScienceDaily
so naturally BLF was the first place I looked.

There is a previous BLF topic here : WTB Deep Red LED Flashlight or build one for me - #33 by hank

Who here is at UCL ?

It’s not entirely comparable since it is a food additive instead of a medical treatment. Regardless, the initial approval involved, was as far as I know, a normal volume of research. However, due to problems in the initial research submittals used to grant it approval, which seem like deliberate corner cutting by the manufacturer, it went through years of followup review. I wouldn’t be surprised if, as a result, it’s one of the best studied food additives there is.

Are you suggesting that FDA approvals should take longer than the 2+ decades that aspartame ultimately went through between initial application and the end of all the challenges?

I recently ordered a fairly priced custom 2x red + 2x deep red quad star @ HotRed Official Store, you may want to check this “deep red” search there.

thank you very much for helping to educate me about real world options to translate theory into practical action

maybe this LED I found thanks to your search, could be a basis for conversation and comparison

what I notice that seems useful (Im really new at LED shopping), is the 3535 footprint, the 16mm mcpcb, and the 3 volt category… since that fits with my limited knowledge of the traits of the sw45k I put into a Nitecore EX11.2.

Im considering that EX11.2 as a potential host for the Red Led… a simple platform that Im familiar with, and can mod easily with preflowed LED board swap…

another light I am considering making Red capable is the AAA Coopper Tool for which I would do my own reflowing (which I learned how to do recently, and have been enjoying very much)

Hey! The deep red emitters link you grabbed is a 100 piece sale. O:)

HotRed sells a wide range of super cheap 0K quality copper MCPCBs, of which most of them are DTP (the 20mm 3535 XPE and the 20mm XML/5050 look non-DTP).

Here is their sale link for a single XP-E photo deep red 660nm: https://www.aliexpress.com/item/32699141532.html (10 pcs pack here).

Since you can select bare led or led mounted on a cheap aluminum star, I am pretty sure they will gladly reflow your deep red emitter on a ∅16mm copper star (those are DTP, I have ;-) them at home) if you send them a message after purchasing the emitter(s) and board(s).

thanks, I did not need 100 of them… LOL

Estimated Delivery on 09/24

I will think it over

If you’re buying it presoldered on an MCPCB, the footprint does not matter directly. If you’re going to reflow it yourself, then you need to make sure that in addition to the size of the footprint, the solder pads having similar dimensions and polarity.

The most popular form factor matches the Cree XP series - 3535 with an electrically neutral thermal solder pad in the middle. In addition to the Cree XP-series, the Cree XHP35, the Nichia 219 series, the Samsung LH351 series, and the Luminus SST-20’s use that footprint.

Mountain Electronics has a 20mm MCPCB with a 660nm XP-E on it. They list a 16mm version as out-of-stock, unfortunately.

Cutter (in Australia) has the XP-E in 660nm photo red and 730nm far red, and can mount it on several different sizes of MCPCB’s. If I remember right, they do ship to the US, but I don’t know the cost.

https://www.cutter.com.au/product-category/led-emitter/cree-led/cree-xlamp/cree-xpe/cree-xpe-colours/

I’m sure they can be had from Digikey or Mouser, too, but I don’t have time to dig up part numbers to search at the moment.

I have both Emisar D18 and Emisar D4V2 with deep red SST-20-DR emitters. They are fun to use, and quite bright! :slight_smile:

For a small fee, Hank from intl-outdoor can build a flashlight for you with custom emitters. I emailed him and asked for SST-20-DR-B120-V660.

Note that the human eye is significantly less sensitive to deep red light, so if you get a flashlight with only 1 deep red LED it won’t be very bright.

Selecting same shipping option for both items means shipping gets combined.

Now, that's some real good news! What driver did Hank use for the Emisar D4V2? I can't imagine that SST-20-DR will like high currents with FET. Did he use the 5A driver from KR4 or is the maximum current limited by software (Andúril)?

There is nothing different about it, it uses the standard D4V2 driver.

I don’t think Hank used limited FET firmware (typically used for Nichia 219) in mine. I assume he would have told me if he did, so that I would know to use the limited FET firmware when I flash a new version.

SST-20-DR is rated up to 3A, which is the same as SST-20 4000K. It seems to heat up less than my D4V2 with SST-20 4000K, so I assume it is not pulling too much current. Maybe it is more efficient? It does have a low Vf, so I wonder how much current it is actually pulling, and if it could be an issue.

https://download.luminus.com/datasheets/PDS-003040-Rev-04-SST-20-DR.pdf

While I don't know the fine details of what you are discussing concerning that D4V2, I will just say that driving deep red emitters in parallel with an unregulated driver is just bollocks. Even a linear driver is inadequate, because the large voltage difference between input and emitters Vf needs to be dissipated at the regulators, being very inefficient and causing massive heat dissipation.

The right answer is a buck driver, or a boost driver with emitters in series (or boost-buck if 2S2P). Maybe its time to develop some :???: new driver, because every time I look for buck drivers in the chinese market it either makes me want to cry or kick someone else's arse let's say I just don't like what I see. O:)

I’ve seen the same press coverage regarding this. I’ve got eye issues and I support myself and my family doing graphic design and it’s a great worry as I get older. I want to look into this to support my eye function going forward.

There’s not much info about how to make a 670nm red light source, though you can buy them for upwards of 100 EUR. I’m certainly no technical whiz, but any tips gratefully received.

Thanks!