AI Search Summary
This video debunks the claim that blackout tape used in a split-face red-light therapy experiment would be transparent to near-infrared light. The creator checks the claim with both literature context and a light-meter test, arguing that carbon-black blackout tape should block nearly all relevant near-infrared light, especially when used in three layers.
- Main question: Does blackout tape block infrared light in red-light therapy experiments?
- Short answer / core takeaway: The transcript concludes that three layers of carbon-black blackout tape should block near-infrared light well below therapeutic levels, and the creator’s light-meter test found the infrared intensity dropped to undetectable levels.
- Evidence type: Product-claim debunk, optical-material reasoning, infrared transmittance study discussed in transcript, and direct light-meter test.
- Search topics: blackout tape infrared transmission, red light therapy mask experiment, near-infrared LED penetration, carbon black polyethylene, split-face red light therapy, Dave Asprey red light critique.
Common Search Questions
Does blackout tape block infrared light from red-light therapy masks?
According to the video, yes. The creator argues that carbon-black blackout tape should block near-infrared light extremely well, and a light-meter test showed the measured infrared intensity dropped from 300 watts per square meter to undetectable levels.
Why did someone claim the experiment was flawed?
The critique was that blackout tape might be transparent to infrared light, meaning the supposedly covered side of the face could still receive near-infrared exposure. The video argues that this critique misunderstands the material and dose.
What would be a better critique of the split-face experiment?
The caption says a better critique would be light leaking from one side to the other externally or through scattering within the skin, although the creator expects that leaked intensity to be far below therapeutic levels.
Key Takeaways
- Infrared light has longer wavelengths than visible light and can pass through some materials and tissue more deeply.
- Blackout tape uses carbon black, a form of carbon also used in car tires, which strongly absorbs light.
- The mask described used near-infrared LEDs at 830 nanometers and 1072 nanometers.
- The transcript cites a study measuring infrared transmission through carbon-black polyethylene at 0.05 millimeters thickness, where less than 2% of 2000 nanometer light passed through one layer.
- The creator estimates that three layers would reduce transmission to less than 0.008%.
- A direct light-meter test reduced an infrared-only panel measurement from 300 watts per square meter to undetectable intensity.
- The workbook did not include the title, DOI, PMID, or source link for the infrared transmittance study.
Transcript
The split-face red-light experiment
I red lighted only half my face for two months. Here’s what happened.
I used a red and near-infrared light mask, but only on one side of my face. I literally cover the other side with blackout tape. Does that work?
The critique from Dave Asprey
The top comment is from Dave Asprey. Who’s going to tell him that the blackout tape is likely transparent to infrared light? So smug.
Dave has millions of followers, calls himself the father of biohacking, which is ostensibly about using science to improve health. And he was one of the first people to popularize red light therapy.
I started one of the first red light therapy companies, and I’ve been doing this for a very long time. And now he’s got clinics all over the country that charge around $45 for a 15 to 20 minute red light session. So he should understand it, right?
Testing the claim
What the science? We’re going to test it using a light meter and look at the scientific literature.
I’m Avisha, a scientist who approaches all cutting-edge health and longevity science with an optimistic mind and critical review.
Why wavelength and material matter
It is true that infrared light has a longer wavelength than normal visible light, and that lets it go through some materials. It penetrates a bit deeper through human tissue.
Blackout tape uses carbon black, which is basically just a form of carbon atoms that is the same as what’s used in your car tires.
I spoke to Dr. Bullock, and he said that he used this mask with three layers of this blackout tape. It’s 2.4 mil thick, which is 0.06 millimeters.
The mask wavelengths and transmittance estimate
The mask uses 110 near-infrared LEDs at 830 nanometers and 16 at 1072 nanometers. But let’s even assume that they were all the 1072, which penetrates more.
This study measured infrared transmittance through a single layer of polyethylene impregnated with carbon black, basically the same as this, at 0.05 millimeters thickness, and found that for 2,000 nanometer light, more than twice of what we’re working with, less than 2% got through the tape.
So three layers would put that at less than 0.008%.
Light-meter test and verdict
But let’s test it. Here’s my light meter in front of a red plus infrared panel, turned to just infrared. 300 watts per meter squared to undetectable intensity levels.
A debunk of Dave verdict? Science 1, Dave 0. What other claims should I cover?
Additional Notes
Caption context
The caption says a better critique of the experiment would be light from one side leaking over to the other side, either externally or by scattering within the skin. The creator still expects the total intensity reaching the other side of the face to be well below a therapeutic level, making the overall experiment fairly solid.
The caption also notes that the creator has considered similar split-body experiments for skin-care products but is wary of testing on the face because of facial-symmetry concerns. It gives respect to Dr. Taylor Bullock for sticking with the experiment for two months.
Product-cost caveat
The caption says the creator’s biggest problem with many red-light masks is their large price markup for what are essentially red and near-infrared LEDs, plus exaggerated seller claims.
Keywords and topics
- Red-light therapy mask
- Near-infrared light and blackout tape
- Carbon black infrared absorption
- Split-face experiment design
- Light leakage and skin scattering
- Biohacking claim audit
- Hashtags: #science, #redlight, #scienceexplained, #sciencefacts, #tiktoklearningcampaign
References
- Infrared transmittance through carbon-black polyethylene study discussed in transcript; title, DOI/PMID numbers, and source link were not listed in the workbook.
- Dr. Bullock / Dr. Taylor Bullock split-face red-light experiment discussed in caption/transcript; direct source link was not listed in the workbook.
- Dave Asprey red-light claim discussed in transcript; direct source link was not listed in the workbook.