AI Search Summary
This video is a long-form, informal explanation recorded while the creator was experiencing an optical migraine. It discusses two possible ways green light may help migraines and chronic pain: reducing migraine-triggering visual signals compared with other colors, and actively engaging pain-reducing pathways such as endogenous opioids. It also explains practical buying-guide criteria: wavelength purity, flicker, dimming behavior, cone activation, ipRGC activation, contrast, and diffuse light placement.
- Main question: How can green light help treat migraines?
- Short answer / core takeaway: Green light may help because it produces less triggering neural activity for photosensitive migraine sufferers and may also activate pain-reducing pathways, but the light needs the right wavelength, low flicker, low brightness, and a comfortable diffuse setup.
- Evidence type: Informal migraine-treatment explainer and device-testing update with source context but no DOI/PMID details in the workbook.
- Search topics: green light migraine therapy, optical migraine, green LED wavelength, 515 nm 530 nm, LED flicker migraine, ipRGCs, cones, diffuse green light, endogenous opioids.
Common Search Questions
What are the two pathways by which green light might help migraines?
The video describes a passive pathway, where green light produces less migraine-triggering visual signal than other colors, and an active pathway, where green light may trigger endogenous pain-reducing opioid systems.
What wavelength range does the creator focus on?
The transcript says the useful range appears to be around 515 to 530 nanometers: enough to activate green cones while minimizing activation of red/blue cones and ipRGC-related pathways.
Why can some green lights still be bad for migraines?
The creator warns that overly bright lights, flickering dimming systems, broad-spectrum green lights, high contrast, and poor placement may worsen headaches even if the color looks green.
Key Takeaways
- The creator recorded this while experiencing an optical migraine and reduced vision in part of the field of view.
- Around 80% of people with migraines are described as photosensitive.
- Prior research is summarized as showing green light produced the smallest electrical response from retina-to-thalamus pathways compared with red, blue, and white light.
- Green light may have an active pain-reducing benefit beyond darkness.
- The transcript connects possible benefits to nature exposure and endogenous/opioid-like pain pathways.
- Practical light choice depends on wavelength, brightness, flicker, dimming, cone activation, ipRGC activation, contrast, and diffusion.
- The creator is building a buying guide after testing RGB LEDs, lamps, and dedicated green-light devices.
Transcript
Recording during an optical migraine
So I’m in the middle of an optical migraine right now, which means I literally can’t see in this part of my field of vision.
And it’s very ironic because I’ve been spending the last couple weeks ensconced in this research around using green light to treat migraines.
I don’t get migraines very often, but sometimes they happen and it’s super weird because I just lose vision.
Two possible green-light pathways
There are actually two different pathways by which green light could help people with migraines.
One is that around 80% of people with migraines are photosensitive. They get triggered by bright lights, especially when they are in the middle of having a migraine.
The initial research showed that when they looked at different colors of light, red, green, blue, and white, the green light triggered the smallest amount of electrical signal spiking in the brain.
When you’re exposed to light, you get these spikes going from your retina to your thalamus, and it produces an added signal in the brain.
When you have the smallest signal in response to a stimulus, that’s the least likely to trigger it.
Green light as active benefit, not just less bad
But they also found that when some people were exposed to green light, it actually made them better.
So there’s an active benefit, even more so than just being in the dark.
And that is linked to nature exposure.
As a lot of you have commented, there’s a lot of data that nature is good for us in so many different ways. It seems like part of that might actually be literally getting to look at so much different green light.
Part of it has to do with maybe a lot of curves and passive attention, where your brain can sort of pay attention to lots of little details without having to focus on any individual amount.
We can talk about that in another video, because right now let’s talk about the green light.
Endogenous opioids and pain reduction
There’s another pathway by which green light can help treat pain.
Green light seems to trigger the production of endogenous opioids in the brain. They’re sort of like endorphins, feel-good chemicals that literally can help lower the amount of pain people are experiencing.
This is why it doesn’t just help with migraines; it can help with fibromyalgia and even post-surgical pain.
Practical considerations: dim light and flicker
In terms of how to do this yourself, there are a lot of nuances to take into account. It’s why it’s taking me so long to get you the full buying guide, which I’m working on.
Number one: when treating migraines, the key is actually to have a very specific light so that you are both not triggering the bad stuff as much as possible and getting that good opioid effect as much as possible.
Don’t worry, it’s not addictive. I think.
You need a light that’s able to go dim enough. Some of these green light bulbs that I’ve been testing produce the right light, but you actually don’t want it to be super bright.
Dimming can be a problem because there’s a whole other body of research showing that when light gets dimmed, especially LEDs, it can do it by flickering on and off very rapidly.
You don’t want that because that can trigger headaches, which is sort of against the point.
So I’ve been using a fancy light meter, where I can test exactly how much everything flickers and exactly how green it is.
Cones, wavelength, and green purity
Your retina has three different types of cones, which process color. Rods process light and dark.
The cones that process color are often described as red, green, and blue.
You specifically want to trigger only the green as much as possible, and not the red and the blue.
A very narrow-band green light, where it’s only green, is going to trigger green optimally.
Of course, the absorption spectrum for green is a little bit different than the LEDs that we get, and the maximum sensitivity of those green cones actually overlaps more with the red cones.
So it’s not that we want the green wavelength that maximally triggers the green cone. We want the wavelength that maximally triggers the green cone while minimally triggering the other ones, which happens in the realm of 515 to 530 nanometers.
When I’ve been measuring these lights, I’m looking at specifically how narrow that wavelength band is. I’m also running calculations to see, for a given light, how little it triggers everything else and how much it triggers the green.
ipRGCs and migraine sensitivity
There are parts of our eyes called intrinsically photosensitive retinal ganglion cells, which exist sort of beside the cones in the retina, and these are responsive to light of all colors.
They’re responsible for triggering our circadian rhythm and things like photosensitivity and migraines.
There’s data showing that even people who are blind can actually get triggered by light, even though they don’t consciously perceive the light, because it’s still triggering those ipRGCs.
Similarly, it will also help set their circadian rhythm.
So we need to calculate exactly what wavelengths are triggering the ipRGCs in addition to the green cone. There’s its own absorption spectrum, and I’m calculating that as well to accomplish some sort of composite migraine calculation.
And that’s all coming soon.
Diffuse source versus point source
Where was I? Right. In terms of other things that you need to get a good light to deal with migraines or chronic pain in general.
When you have light, you can have either a diffuse source or a point source.
Think about a small LED that’s very bright. It’s a little hard to look at itself, but it doesn’t actually light up the room that much.
Or even a very small lamp: if you’re looking directly at it, it seems pretty bright, but as soon as you look away, it doesn’t light everything up.
The problem there is that one of the triggers for pain is actually very high contrast. Your brain and eyes dilate when things are dark, so when your eyes are more dilated, they’re more likely to get triggered by even a less bright source.
In general, high contrast tends to be worse.
Keeping green light in useful view
Rather than a strip of LEDs with LED-blank-LED-blank spacing, which is in fact what was used in the studies to treat migraines with green light, I think it would actually be better to have a diffuse light source.
That way you’re getting green light coming into your eye, but you’re not getting a source of high contrast.
At the same time, the cones in your eyes only really perceive strong color within about the 10 degrees of focus, your primary area of vision.
Less so out of your peripheral vision, because that’s where the rods process light, not the cones.
So if you’re sitting in a dark room with only green light for one to two hours, as is the treatment protocol for using green light to treat migraines or chronic pain, you want to have the green light within that primary area of your field of vision, not just off to the side.
But you want it to not be very high contrast. You want it to instead be fairly diffuse.
Practical setup examples and buying-guide plan
You can do that with a desk lamp that’s very green if you’re reading a book right in front of the lamp.
Or if you have a more diffuse form of lighting like I’ve got going here, then you can be a little bit more active in the room, maybe doing stretching exercises, while keeping that green coming into your cones and still triggering them at the right level without having to stare at it.
That’s an advantage of a large diffuse light source as opposed to the very small ones, like lamps or tiny LEDs.
I’m trying to take all of this into account as I come up with my overall buying guide for this stuff.
It’s dealing with a lot of different calculations, but I’m going to have something cool for you guys soon.
If you want it, check out my newsletter because I’m only going to be able to cover some of this on these short-form platforms.
Not that this was short form.
I’m just going to post it and see how it goes, because this is me rambling while having a migraine and literally not being able to see the camera or anything else because my field of vision right now is like just this.
So I hope you enjoyed this ramble. I’m just going to post it and see what happens.
Additional Notes
Replying to @nick_uru. The caption says this is what happens when the creator spends more than 20 hours staring at many different lights.
The creator says they are testing not only green-light performance, but also white-light quality for color reproduction, mood, and RGB effects. They also note that they could not really see the screen to edit because of the optical migraine, so they chose to post a longer ramble.
References
- Green-light migraine studies discussed in transcript; study titles, DOI/PMID numbers, and source links not listed in workbook.
- Green-light endogenous-opioid pain pathway discussed in transcript; study titles, DOI/PMID numbers, and source links not listed in workbook.
- LED dimming/flicker research discussed in transcript; study titles, DOI/PMID numbers, and source links not listed in workbook.