670 nm Light Source

Blackbody spectrum vs LED (brown curve, right)

Incandescent light has basically a black body radiation spectrum. The wavelength is inversely proportional to the temperature and the power is proportional to T⁴. I don't know why 670 nm light would have this effect, but I would say no, the spectrum would be much broader than the LED so probably not.

You can buy a 680 nm LED from places like Mouser and other companies.

https://www.mouser.com/Optoelectronics/LED-Lighting/LED-Emitters/High-Power-LEDs-Single-Color/_/N-8usfn?P=1yzozpc

Here is some more information. The medical term is "Photobiomodulation", also called "Low-level Light Therapy" or LLLT. There are a number of parameters besides wavelength that are deemed to be important.

"Low level light therapy refers to the use of light in the red or near-infrared region, with wavelengths usually in the range of 600 to 700nm and 780 to 1100 nm, and the laser or LEDs typically having an irradiance or power density between 5 mW cm−2 to 5 W cm−2. This type of irradiation can be a continuous wave or a pulsed light consisting of a relatively low-density beam (0.04 to 50 J cm−2), but the output power can vary widely from 1 mW up to 500 mW in order not to allow thermal effects [8]. The wavelength range between 700 and 780 nm has been found to be rather ineffective as it coincides with a trough in the absorption spectrum of cytochrome c oxidase (see later). Moreover red/NIR light is chosen because its penetration through tissue is maximal in this wavelength range, due to lower scattering and absorption by tissue chromophores. Although for many years it was thought that the monochromatic nature and coherence of laser light provided some sort of added benefit over non-coherent LED light, this view is no longer widely held. Continuous or pulsed light sources have both been used. The studies performed for PBM on acute pain and pre-operative analgesia show that a single treatment (usually only 30–60 seconds) is enough to cause analgesia, while for chronic pain and some degenerative conditions, more sessions are required [5]."

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5436183/

This light therapy has such a beneficial effect on health,I wonder about the effect of having red filters on office building windows or in the interior lighting.

Would it affect the health and morale of the workers?

Is the LL therapy effective in the presence of other light,or must all other light be excluded?

Inquiring minds want to know!

This light therapy has such a beneficial effect on health,I wonder about the effect of having red filters on office building windows or in the interior lighting.

I think they usually recommend exposure for only a few minutes a day. Depending on what's being done in the office (like reading), not having normal color vision might be disruptive and stressful.

If you want to experiment, you could buy some colored filters and go outside where the light is bright.

https://www.amazon.com/eBoot-Pieces-Transparent-Plastic-Correction/dp/B06VT87HRZ

And there is the after image effect. Exposure to just red light would depress the red sensors in the eye, giving everything a cyan cast. Cataracts and old age tend to lower the perception of blue colors due to coloring of the eye lens. Suppressing the red might temporarily improve color balance and seem like an improvement with this condition.

Yes light therapy does have an impact on health…

On a similar path… the second Iraq war, soldiers were coming home with PTSD, and the government was looking into meditating.

they contacted a fellow to look into it and found that there was a Canadian company that had special glasses, that depending on the mood you were looking for… it would give a sequence, intensity and positioning of lights (left eye/right eye).

it wasn’t FDA approved and the government wanted to fast track it… so they had this ‘fellow’ develop a plan where they would do testing on horses. They asked the local veterinarian for clients with horses that may volunteer.

he had a proto type for humans and asked if I’d like to try it.

you had dip switches you had to switch for the type of response you looking for…

anyways… I looked at the manual, picked out a relaxing mode… set the switches… and after about 5 minutes I got really po’d… I took the manual back out and the setting were right… I called that guy up… and he said… oh I forgot to mention,… there was a misprint on the manual… the setting I made, made me really anxious…

so yes,… it can be light therapy or a sick weapon…

Let's be clear here, DO NOT USE LASER LIGHT IN EYES...caution with lasers is essential to avoid contact, even reflective in nature, with eyes...always wear laser safety glasses when operating lasers....lasers are not toys...

I see a great opportunity here for a lucrative product:

A "YOUTH BOOTH",similar to a tanning booth,where a person can spend time to renew their mitochondrial DNA.

Simply change out the tubes in the tanning (aka: Aging Booths) to high power LEDs and operate on a timer to prevent over dosing.

I no longer have the drive nor capital to pursue new ventures,but the opportunity is certainly there.

Any takers on this idea?

Why not combine it with 222nm far uvc lights and disinfect people at the same time...? A good street corner business in a big city....

You could buy old phone booths and convert them...

Better leave a few phone booths around Metropolis for Clark Kent.

If you are watching Clark Kent enter a phone booth, and then seeing Superman emerge, are you really fooling anybody?

Only if all you know is what you read in the funny papers.

You mean like Hal...sure Dave

link me Hal

Mo' better....don't forget the lens 60° , and driver with shell....you will probably need to wire a plug on...old extension cord

https://www.ebay.com/itm/392047280911

Thanks for the info,SE.

I have researched the discrete devices,but they are too small for me to handle,or they are not precisely 670nm.The star-config with screw mount is doable,but the freq. is not right.

Also,the frequency should be at 670 nm precisely.

This is the only wavelength they have supporting data for.

Kinda like the opera singer breaking the glass,must be at the right frequency to work.

I am now looking for an optical filter for 670nm,that way I could use an incandescent flashlight bulb,with reduced voltage.

The ones I have found are very expensive($70).

I wonder what the wavelength of the red filter in the old military flashlights were?

Any way to find out?

Anyone have a wavelength meter that will read in the far red range?

"Red light emits wavelengths of between 620-700 nm. All red light wavelengths are effective and offer health benefits, although certain wavelengths are more powerful than others--particularly those that fall between 630-680nm. Visible red light within this range can penetrate deep into the skin, offering rejuvenating and balancing outcomes for a range of health conditions."

I believe it is roughly the same effect within a range of wavelengths in this area...I believe 670nm was chosen arbitrarily...

https://medicalxpress.com/news/2020-06-declining-eyesight-deep-red.html

Hey there's an app for that...

https://play.google.com/store/apps/details?id=com.martin.redmed&hl=en_US

I just installed jlight for iphone from the app store...works great and acts as a flashlight as well....what a time we live in....

https://apps.apple.com/us/app/jlight-flashlight-for-iphone/id490656360

Thanks SE.

When it comes to phones,I am a LowTeckRednek.

I still have a flip phone.

A real throwback, I know,but it serves my purposes. I simply use it as an audio device,you know,like we did in the the old days of analog hard-wired phones.

Back in those you could talk freely,except for a small monthly fee.

Now the saying: "Talk is cheap" does not apply.

It is a lot better than smoke signals or telegraph I suppose.

I don't travel anymore,don't play games on the phone,or use a phone as an internet browser.I am retired,live frugally,and cannot justify the cost of the new phones.Eventually,the flip phones will be antique collector items and I will have no choice but to upgrade.Till,then I am "Lost in the '50's" I guess.

(I will always be lost in the 50's with my wife of 50 years.)

https://www.youtube.com/watch?v=ueU3gorZEcs

The app for the red light will not install on my computer,so the best I can do is copy the image and enlarge to full screen,and hope my monitor displays correctly.

Do you think that will work?

Sure red is red...stare at this for 10 minutes every day....

Click on red for full screen viewing....

Well I guess it could be worse....

Yep,… back in the 90’s cell phones we’re getting smaller and smaller…

not their getting bigger and bigger… )for the larger screen… still better than that brick.

My wife and I have been married 32 years and I use this phlip fone. (O.K. I'm a young whipper-snapper at 57 years. )

Water resistant to 2 meters, I've dropped it more times than I can count, gets crushed in my pocket when I am squirming around on the concrete under a vehicle, and I charge it once a week whether it needs it or not.

Texting using num pad is slow but I don't do much of that. Short update messages or a quick inquiry. I can access the Internet on the data plan my wife has for her power hog, delicate, huge mini-tablet of a phone. Tiny screen with low resolution but I did check in to a Southwest flight using it once. Again, I am on a computer all day at work, I don't need a computer in my pocket the rest of the day. The camera is barely decent. But that's OK. I have a camera to take good pictures when I need to do that.

The Sprint store had to special order it when my wife went to get me a new phone to replace the Motorola Razr I had on our Verizon plan.

I don't need a big phone, nor do I want to lug one around. This one fits in any of my pants pockets, is rugged and does exactly what I want in a phone.

Long live the Phlip Fone !!

Before the cell phones, Single Side Band CB radio was very popular, "Breaker Breaker 1-9"

Then there was Dual Band CB radio,twice the channels. Co-Phased 1/4 wave antennae with a Raccoon tail tied on top,flapping in the breeze.

Gun rack mounted on the back window of your 4 wheel truck,deer antlers as a hood ornament,'Baccer juice on the side of the door..if you were married,there would be juice on both doors....OOPS! Excuse me I digress to the time I lived in Arkansas..(That's a joke,boy,a joke.https://www.youtube.com/watch?v=EVAdt5bH2tE)

Now,back to the topic of interest:

The first cell phone I had was a bag phone,powered from the cigarette lighter socket,and a wall rat charger that didn't work.

Weighed about 6 pounds,looked like a small briefcase.Most of the weight was battery.

It had a "follow me" feature,so no matter where I was,I could call home base if needed with no hassle.It used the cell phone towers for tracking.Back then it was an option,now it is standard.

We have come a long way,except for a few states,not naming any names though.

You are much better off generating the wavelength that you want than generating wideband light and filtering out everything else, both efficiency-wise and cost-wise.

I don't know if this helps:

https://ledlightsworld.com/products/5-meters-deep-red-660nm-670nm-smd2835-300leds-flexible-led-strip-lights

https://www.mouser.com/Optoelectronics/LED-Lighting/LED-Emitters/High-Power-LEDs-Single-Color/_/N-8usfn?P=1yzozpc

I found an old mil flashlight in my tackle box.Placed beside the red on the screen image,it is very close to a match.

I will use it in front of a pr2 bulb to test.

Current cost:zero$

If you really want an expensive light source that does nothing but drain funds out of your bank account . . . .

. . . between $900 and $3,000 depending on which level of 'treatment' you require, "value" = 82 diodes, "mid-range" = 202 diodes, or "premium scam" = 272 diodes. No wonder the lawyers are lining up outside the door.

I have tested the wavelengths of lots of red lights with my $1500 spectrophotometer, looking for cheap bright red lights around 630 or 660nm red, which are optimal for pain relief and wound healing according to peer reviewed studies. (For pain, 20minutes of treatment per area per day is recommended, or more frequently if pain returns before 24hrs, but never more than 20min at a time.)

And the winner is...

Bicycle tail lights, not the kind with discrete single LEDs but with a large chip on board, like the KNOG Plus (i have no financial interest or affiliation).

The best are USB rechargeable with high and low levels of solid red light (don't use flashing for any treatment!). Price is $10-$30 retail and it will never burn out. I use the brightest setting for treating pain, and dimmest for treating my eyes (only 1 minute per day).

With pain therapy, the red light is placed directly on the painful area. With vision therapy, you are only supposed to look at the red light from a distance (in an otherwise darkened room)

Please don't try putting these lights directly over your eyes, even if eyelids are closed. These wavelengths cause heme proteins to release carbon monoxide, which can really mess up your vision temporarily.

Not only that but it grows hair as well!!!

Really great for cold weather....

New capillis urban sombrero ...

This guy used to be bald...

Ooops, now you've gone tooo far....

Did you see how much those things cost?

No wonder they can afford to saturate the TV market with ads.

Do you think he has one under his fedora?

Have you tested the regular,old fashioned brake light lens placed over an incandescent bulb?

The red filter from a military flashlight seems to be a pretty good match to the color on my monitor,but I know the monitor does not produce true-to-life colors.

It would be interesting to know the actual wavelengths of the automotive brake light lens,or maybe even the red reflectors that are ubiquitous on trucks and trailers.

Thanks for your feedback on this.

Have you tested the regular,old fashioned brake light lens placed over an incandescent bulb?

The red filter from a military flashlight seems to be a pretty good match to the color on my monitor,but I know the monitor does not produce true-to-life colors.

It would be interesting to know the actual wavelengths of the automotive brake light lens,or maybe even the red reflectors that are ubiquitous on trucks and trailers.

Thanks for your feedback on this.

Oh no,, that red light has me seeing double.....help!

I know that this is an old post but I did find the U.S. version of the red light therapy flashlight and spacer that was used in the UK study.

It is called the Eagle 670 and Walmart.com has it for about $20 dollars. There are 2 settings so you will need to use the lowest setting with the spacer for the eyes.

https://www.walmart.com/ip/New-Version-670-nm-Red-LED-Light-8mW-cm2-USA-Lab-Verified-670nm-LED-Flashlight-w-Silicone-Spacing-Tube-Easy-on-The-Eyes-no-Blue-Light/19261707531?classType=REGULAR&from=/search

Hope this helps everyone.

I know that this is an old post but I found the U.S. version of the red light therapy flashlight that was used in the UK study that was in the link

It is called the Eagle 670. You can get it on Walmart.com for about $20 dollars.

It has 2 settings. You will need to use the lowest setting and spacer for the eyes.

Hope this helps.