[bethekind]

I have so many questions about both apparatuses. 90W input or irradiated? Pulse width modulated/dimmed? Lasers? LEDs? 850nm? 830nm? 810nm?

For the panel, 1800W is a LOT of power to put through 2 feet. Is it actually 1800W? What wavelengths? PWM?

I've been using a NIR belt flipped inside out on my pillow the last few weeks. It's only 6W of 850nm, but I've been feeling less dumb recently. Not sure if it's correlated, but until I settle it for sure, I'm going to keep on using it.

[cowsaymoo]

The prototype came with a power supply that is set at 24V, 5A and consumes 90W when running. Not sure how the control circuits work but its pretty simply operated with a 3P2T switch for 650nm/Off/850nm. Each module contains a fan cooled array of LEDs behind a plastic lens. I think it has some thermal shut off protection circuit as well.

I just dug out the spec sheet for the other device and you're right. It says "LED Power Class 1800W", but lists power consumption as 350W.

I really like it's potential to improve the right kind of symptoms when applied correctly and I'm also wary of people with bottom line incentives filling in any scientific uncertainty with miracle cures. But I agree, it's definitely worth using. It's a one time purchase with no side effects, so the worst case risk is just disappointment.

[throwway120385]

It would probably be 1800W continuously but is pulsed and the duty cycle probably limits the power to 350W.

[b112]

Can light penetrate the skull bones though?

[lukeinator42]

yes, and you can even use infrared spectroscopy to infer brain activity via the bold signal: https://en.wikipedia.org/wiki/Functional_near-infrared_spect...

[ankitml]

infrared, yes. Although depends on skin colour wrapping the skull. Melanin absorbs everything under the sun. It has very high absorption of UV but somewhat absorbs infrared too in this range of frequencies. Darker the color of skin, higher the melanin and higher the absorption by skin.

[energy123]

Yes

[CyberDildonics]

Light is anything in the spectrum visible to people, with the exception of infrared being called light. What evidence do you have that this is true?

[kjs3]

Not wanting to violate the "don't tell people to google the obvious, no matter how condescending they're being", I googled the obvious for you.

https://link.springer.com/article/10.1007/s10103-024-04024-z

To achieve a neuroprotective effect, PBM must overcome several barriers, including bone tissue, a complex structure with variable optical properties

https://www.spiedigitallibrary.org/journals/neurophotonics/v...

Photobiomodulation (PBM) is a near-infrared (NIR) light-based therapy technique and has shown therapeutic effectiveness for various neuropsychiatric disorders, including MDD. The transcranial PBM (t-PBM) technique delivers NIR light through the scalp and skull.

https://www.frontiersin.org/journals/neuroscience/articles/1...

Near-infrared spectroscopy in the brain is made possible by the relative transparency of biological tissues (including bone) to light for infrared wavelengths ranging from 650 to 925 nm.

[CyberDildonics]

https://www.frontiersin.org/journals/neuroscience/articles/1...

Penetration of light from an 820 nm gallium-aluminum-arsenium laser diode through a sample of fresh human skin. Data extrapolated from data presented in Kolari (25) and shown in the blue columns. A line of regression is shown by the black dotted line. The regression line indicates that light from a low-power laser diode can penetrate less than 2.2 mm into human skin.

This says that a 820nm laser penetrate 2.2mm into human skin. That is 0.08 inches. That is about the width of a groove on the top of your finger. How does that square with saying that it could go through skull bone that is 3.5x as thick while being more dense than tissue?

[Filligree]

Radio waves do with no trouble. Blue does not at all. Everything between is on a sliding scale; there are no qualitative changes until you get to ionising radiation.

Though there’s a bit in the middle where it matches the resonant frequency of water molecules, yes.