670nm deep red led helps eyesight

LED Flashlights – General Info
269

I just learned that some colorblind people are a lot less sensitive to photo red. I wonder if anyone here has that issue and does not know about it. I wonder if that means that far red light, which most of us can still see, is completely invisible.

https://www.reddit.com/r/flashlight/comments/aeik5b/rare_photo_of_man_being_alive_and_dead_at_the/edqdgte/

My test subject basically couldn’t even see the deeper shades of red. Like using some red emitters and adjusting the brightness showed he was 25x less sensitive to photo red than I was. So that much-lauded R9 number is basically worthless to the red-green colorblind. (The other types are so rare to not be worth considering.)

270

If they have reduced red perception they may be able to see other colors but I would expect that far red would be too faint.

If they just lack the L cones that discriminate between green and red they won’t be able to see it at all or at least have big issues seeing it. If you trust the Wikipedia graph, M cone sensitivity pretty much goes to 0 at 660nm and beyond.

OTOH IIRC someone (you?) in this thread have said that they can tell apart 660nm and 730nm by color. The cones can’t detect wavelength directly, the color perception comes from the difference between each cone signal. If the signal from the M cones is already at zero you shouldn’t be able to tell the two wavelength apart, unless you have 4 types of cones (the extra cone is between M and L cones). Of course it could just be ambient light messing with the color perception.

271

I can see that my XP-E2 Far Red 730nm flashlight looks slightly less orange on a neutral background than SST-20-DR 660nm.

The dominant wavelength for a 660nm led is probably about 645nm. Since these leds are not pure emitters of just 660nm or 730nm wavelength of light, I am probably just seeing orange because of the portion of emitted light that is below (for example) 640nm.

272

it was 620 and 660

further up this page I also posted 660 and 730, but the difference is not as obvious in a photo. They still look different side by side (the 660 is more orange than the 730). Plus 730 is like 100x less visible (less bright).

However, even if we cant see it, 730, 810, 900nm all have therapeutic value,
so do 620 and 660nm, and those are easy to see.

so for light therapy, being color blind is not an obstacle

1 Thank
273

AFAIK we don’t know whether therapeutic value (if there is any beyond placebo) is affected by color blindness. We would need a study for that.

274

the mechanism of charging mitochondria is not dependent on being able to see the light

and the mechanism of using a red light to relieve arthritis and migraine pain, has nothing to do with being able to see the light. It works even with eyes closed :slight_smile:

275

Have yall been seeing TV ads for the laser hair-growth caps—one site indicates they are using red @ ~650nm.

don’t know if these are just red leds or actually laser diodes, but they aren’t budget items.
capillus website: “Capillus laser therapy devices use only medical grade laser diodes as a light source. ”

276

Hi guys,

Would this red light be sufficient for the red light eye therapy?

https://www.amazon.co.uk/Balhvit-Rechargeable-Bicycle-Waterproof-Mountain/dp/B077RXY17S/ref=mp_s_a_1_3?dchild=1&keywords=cycle+light&qid=1609706939&sr=8-3

277

Welcome to the forum Edel21

in my opinion, no, because it seems to use cool white LEDs with a red lens.

Not an actual pure Red spectrum LED.

Instead, I suggest you buy a Sofirn C01R
it has a 660nm Red LED, and the driver has 3 modes.

imo the second mode is sufficiently bright for eye therapy

278

Thank you Jon!

279

From reading through the forum Jon, I can see you’ve been using this torch yourself. Do you still practice the red light therapy? Do you hold it at 10 or 28 inches away from the eyes? Do you keep your eyes closed throughout? And is it 3 minutes for each eye?

280

yes I still use red light to wake up my eyes in the morning

I do keep my eyes closed, and I hold the light about 12 inches away. I move it up and down and left and right, because my reading is that movement helps jump start the nerve signaling, in addition to the red light charging the mitochondria

I dont do 3 minutes, I usually stop in less than 1 minute, but no harm in going a bit longer

as an alternative, you can do the same with morning sunlight. At around 10am the intensity is similar to the red light in the study. You will find this is actually quite noticeable through closed eyelids, and the red light I use, at the distance I use it, is actually less intense than morning sun.

I point that out so you have a reference to gauge how close you can hold the red light, without exceeding the intensity of morning sunlight.

I also use red light on painful spots, sore joints, sore muscles, even painful pimples… The red light seems to stop pain, for an hour or two. I notice pimples dry out and heal faster, overnight, instead of a few days.

My daughter who gets migraines, solved the problem shining a red light in her nostrils, for about 30 seconds each. An hour later she reported no Migraine, and the next day it did not return. There are a lot of nerve endings to the brain, at the back of the nose…

I also use red light for sore neck and headache, applied to the painful area.

281

Brilliant. Thank you so much for your comprehensive reply. I really appreciate your time. I will order the Sofirn C01R and use for the same purpose.

282

very welcome
I hope it helps you :slight_smile:

283

I hate to ask but could you post a link to the light you referred to above…I’m a noob and having trouble finding it.
Thanks

284

the 660nm Red light is called
Sofirn C01R (google that for shopping links)

The C01R only comes in a Red body color

it is quite nice, has 3 useful modes

dont get confused by different colors, and different models such as C01 and C01S… for 660nm Red the model you want is C01R

285

Hi
I am building a quad S11 mainly for spotting wildlife just not sure on the led I should use. Is the higher the nm number the better?

Cutter’s has three options that I can see.

  1. XP-E2 Cree Far Red 730nm “XPEBFR-L1-0000-00B01” here
  2. XP-E2 Cree Far Red 730nm “XPEBFR-L1-0000-00901” here
  3. XPG-3 Cree Deep Red 660nm “XPGDPR-L1-0000-00G01” here

MTN has this driver FET + 7135 Driver - 22mm - MTN-22DDm here

thanks for any help

286

no, 730nm is very dim, not recommended

620nm is much brighter, I recommend that

287

Ok thanks I will try and find a 620nm.

thx

288

btw, I suggest you get some green LEDs to try also
I can see much better with Green than Red