670nm deep red led helps eyesight

Interesting. Where can I source one of these?


1 Thank

Nice find
I use this for tendon improvement and training recovery

sounds like the new Sofirn C01S with 660nm Cree led will fit the job.

> Interesting. Where can I source one of these?

thanks for sharing this info about red light, I had not heard it before

what kind of benefits have you noticed?

I wonder if one of the reasons I place such a high priority on LEDs with High R9 CRI (red CRI), is because they help me see better?

thanks for pointing that Red LED AAA light out
now I have another reason (excuse), to spend some (small) money

does anyone have a link to buy the Red LED so I can experiment modding a light for myself?

From link.

Very small sample of people? That’s not research that’s getting a few drinking pals together.

“by up to 20%” and “in some people” are not scientific statements.

I would NOT gamble my eye’s on that kind of “15” seconds of fame paper.

By the way the link goes to “the telegraph” and on the page that is linked to is another bit of clickbait, this time with quite a few more links to “the telegraph” articles.

Not saying that these articles are not interesting but they are by reporters citing other reporters articles to validate there claim’s.

Cheers David … who will keep his eyes away from anything like that.

since I have no education, yet, regarding Red Light Benefits and Risks
I decided to ask google

There is a lot of info to explore, and some of it sounds promising…


Im a senior, and have several vision challenges due to age, and years of staring at computer screens, plus an active lifestyle outdoors, with high UV exposure, surfing and skiing.

If adding a Red LED to my accumulation of lights has any potential benefit, I am happy to learn more about the possibility.

So, Im glad this thread came up. Until now, I saw no reason to consider a Red LED light, but now I have a new modding opportunity.

First, I will practice my due dilligence, by taking the time to read up on the subject of Red Light Benefits and Risks.

here are some of the first references Im seeing:


my first question is

which Red LED should I buy to mod one of my flashlights? :heart_eyes:

Better article from University College of London : Declining eyesight improved by looking at deep red light | UCL News - UCL – University College London

Study : Optically Improved Mitochondrial Function Redeems Aged Human Visual Decline | The Journals of Gerontology: Series A | Oxford Academic

Closed access, but you know… there are ways (don’t know what is BLF policy on this sort of thing)

One curious thing :

Participants placed their eye over the end of the torch. Eyes could be closed as the red light is not filtered by the eye lid.

It is interesting isn’t it? I will have a look at the Sofirn flashlight and do a bit of research myself.

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).