An in-depth look at how we measure the Aurora LED mask, why direct skin contact requires different values than a panel, and what science says about the doses needed for visible skin improvement.

Introduction

If you look around the world of LED light therapy, you’ll see values flying around. 100 mW/cm². 200 mW/cm². Sometimes even higher. The implicit message seems to be: the higher, the better.

But there’s a problem: many of those numbers are not what they seem.

At Panacea Light Therapy, we have chosen to be honest about how we measure and what our figures mean. This means that our values may sometimes appear lower than those of some other brands. Not because our device performs less effectively, but because we test the device differently and more accurately.

In this blog, we explain:

1. How we measure, and why that differs from what many other brands do
2. Why an LED mask with direct skin contact requires completely different dosages than a panel at a distance
3. What science says about which doses are truly effective for cosmetic skin treatment
4. What the Aurora mask is intended for and what it is not

Spectrometer versus solar meter: why the measurement method determines everything

The solar meter: a popular but misleading instrument

Browse a few red light therapy review channels on YouTube, and you'll invariably see the same device: a handheld solar meter, often a TES-1333 or similar model. The reviewer points it at a panel and presents the number as if it were scientific truth.

The problem? Solar meters are not designed for LED light.

A solar meter works by summing all incoming radiation between approximately 400 and 1100 nm into a single number. The instrument is also calibrated for sunlight—a continuous, broad spectrum. When you point it at an LED, which emits a narrow peak at a specific wavelength, three things happen that artificially inflate the number:

1. Spectral sensitivity mismatch. The sensor of a solar meter does not have the same sensitivity across the entire range. At some wavelengths, it "counts" double. For sunlight, this averages out; for an LED peak at precisely that wavelength, the number skyrockets.
2. It measures all radiation, including invisible. Many "red" LED panels also produce near-infrared. A solar meter adds all of that up and provides one integrated number. It appears as if there is more "red light" than there actually is.
3. Calibration to sunlight. Sunlight has a known intensity curve. LED light does not. The factory calibration of the meter introduces a conversion factor that is simply incorrect for LEDs.

The result: solar meters typically give values for LED light that are 2 to 5 times higher than the actual therapeutic intensity present at that specific wavelength. Scientific reviewers have written about this in professional literature, emphasizing the importance of spectrometry over broadband measurements.

The spectrometer: what manufacturers and labs use

A spectrometer is a fundamentally different instrument. Instead of a single total number, it provides a curve: how much intensity is present at each individual nanometer? Then you can read for each LED peak: at 633 nm there is X mW/cm², at 850 nm there is Y mW/cm², at 1072 nm there is Z mW/cm².

Spectrometers are more expensive, more complex, and require expertise to use correctly, which is why you won't see them on YouTube. But they are the gold standard for manufacturers, clinical research, and regulatory bodies.

Our measurements of the Aurora mask were performed with a professional DHSP-3501RS spectrometer. The figures we share are the actual per-wavelength irradiances your skin receives.

What this means for you

When comparing brands, always ask: what instrument was used to measure this?

If the answer is "solar meter," know that the numbers are likely inflated. If the answer is "spectrometer," you're comparing apples to apples.

Why direct skin contact requires different dosages

The Aurora mask is not a panel. That may seem obvious, but the implications for irradiance are often overlooked.

The inverse-square law for panels

With a red light therapy panel, you typically stand or sit at a distance of 15 to 50 cm. Light spreads in all directions, and the intensity decreases with the square of the distance. A panel emitting 100 mW/cm² at the source might deliver only 25-40 mW/cm² to your skin at 20 cm away. At 50 cm, it’s only 5-10.

That's why panel values are often stated high: they need the output to still be therapeutic even at a distance.

A mask bypasses that whole problem

With the Aurora mask, the LED is 0 cm from your skin. No loss due to distance. What the LED emits, you receive 1-to-1.

This has three consequences:

1. Lower source value is sufficient. A panel must compensate for distance losses. A mask does not need to. The ~33 mW/cm² red light we measure on the surface is the same 33 mW/cm² your skin receives. With a panel, you would need a much higher source value for that skin value.
2. Higher source values become unsafe. If we were to apply 100 mW/cm² red + NIR directly to your skin for 20 minutes, you would come dangerously close to thermal limits. NIR is largely converted into heat in the upper skin layers. At 100 mW/cm² direct contact, you risk heat irritation, especially in sensitive areas such as under the eyes. Cosmetic LED masks are therefore typically designed with surface irradiances of 20-50 mW/cm² to stay within safe thermal limits.
3. Consistent, even dose. With a panel, your position changes during a session – your head moves, shadows form, some facial areas receive more than others. The mask follows the contours of your face, ensuring that every square centimeter receives the same dose throughout the session.

So what is "enough"?

For cosmetic skin treatments, the scientifically established effective dose (irradiance × time, expressed in J/cm²) is between 4 and 30 J/cm² per session, depending on the specific application.

Calculate it for the Aurora mask for a 20-minute session at 100%:

• Red (33.9 mW/cm²) × 1200 sec / 1000 = 40.7 J/cm²
• Blue (18.9 mW/cm²) × 1200 sec / 1000 = 22.7 J/cm²
• NIR (12-19 mW/cm²) × 1200 sec / 1000 = 14.4 - 22.8 J/cm²
• Yellow (6.6 mW/cm²) × 1200 sec / 1000 = 7.9 J/cm²

All well within or even comfortably within the scientifically effective range.

What science says about the wavelengths in the Aurora mask

Every wavelength in the mask is chosen based on peer-reviewed research on cosmetic skin improvement. Below is an overview.

Blue (415 nm): impurities and skin balance

Blue light around 415 nm has been studied for twenty years for its effect on acne. The mechanism is photochemical: Cutibacterium acnes (formerly Propionibacterium acnes), the bacterium involved in acne inflammation, produces porphyrins. When these porphyrins absorb blue light, reactive oxygen species are formed that disrupt the bacterium from within.

Research by Papageorgiou and colleagues (2000) in the British Journal of Dermatology showed that regular blue-light application in people with mild to moderate acne resulted in a significant reduction of inflammatory lesions — with 76% improvement with combined blue and red light after 12 weeks. Later reviews by Ash and colleagues (2017) in Lasers in Medical Science confirmed the relevance of wavelength choice for light penetration and effectiveness.

Our 19 mW/cm² × 20 min = ~23 J/cm² per session is well within the reported effective range (15-50 J/cm² for blue light in acne studies).

Yellow (590 nm): equalization and visible redness

Yellow light around 590 nm is less well-known, but it is used to support an even skin tone and reduce the visibility of superficial redness. The proposed mechanism is related to the modulation of inflammatory processes in the upper skin layers.

Recent laboratory research by Hong and colleagues (2022) in Experimental Dermatology showed that 590 nm yellow LED illumination reduces oxidative stress in skin cells and can modulate UVB-induced damage to fibroblasts — a possible explanation for the reported effects on skin texture and visible redness.

Due to the natural physical limitation of yellow LEDs (the "green-yellow gap" in semiconductor technology), yellow LED output is always lower than red. This is a fundamental characteristic of how LEDs are made at specific wavelengths, not a quality difference. Our 6.6 mW/cm² × 20 min = ~7.9 J/cm² is within the range that produced positive cosmetic effects in studies.

Red (633 nm): collagen and skin structure

This is by far the most researched wavelength in LED skin therapy. Red light between 620 and 660 nm is absorbed by mitochondrial enzymes, particularly cytochrome-c-oxidase, leading to an increase in ATP production and stimulated fibroblast activity. Fibroblasts are the cells that produce collagen and elastin.

Wunsch and Matuschka published a controlled study in Photomedicine and Laser Surgery in 2014, in which two groups were treated with red and near-infrared light for 30 sessions over 15 weeks. Both groups showed statistically significant improvements in skin radiance, the appearance of wrinkles, and measured collagen density via echoscopy.

Earlier studies confirmed similar results with LED sources at red wavelengths, including Lee and colleagues (2007) in the Journal of Photochemistry and Photobiology B and Russell and colleagues (2005) in the Journal of Cosmetic and Laser Therapy. Effective doses ranged between 4 and 60 J/cm² per session.

Our 40.7 J/cm² is well within this range.

Near-infrared (850 nm): deeper support for cell energy

850 nm penetrates deeper than red light (typically up to 1-2 mm into the skin, compared to 0.5-1 mm for 633 nm red). It works on the same mitochondrial mechanisms but reaches deeper fibroblasts and cells. An extensive overview of these mechanisms can be found in Avci and colleagues (2013) in Seminars in Cutaneous Medicine and Surgery and Hamblin (2017) in AIMS Biophysics.

In the Aurora mask, 850 nm is present in 78 of the 90 LED packages, combined with red. In the Anti-Aging and Total Care modes, both wavelengths work synergistically. Research suggests that the combination is more effective than either alone, as they target different skin layers.

Near-infrared (1072 nm): focused on the eye contour

This is a less commonly applied wavelength, but an interesting one. Research has looked at 1072 nm specifically for the delicate skin around the eyes, where it is believed to support microcirculation and skin quality. The original work was done with low-power laser and LED sources.

In the Aurora mask, 12 of the 90 LEDs are equipped with 1072 nm, concentrated below and around the eyes. This accounts for ~13% of the mask's IR output. The dosage here is deliberately low; the skin around the eyes is thin and sensitive, and higher intensities would be undesirable.

What the Aurora mask does NOT do

Honesty goes both ways. The mask is an excellent cosmetic device, but there are things it is not intended for.

Not for deep pain or large muscle groups

Pain relief via red/NIR light is scientifically well-substantiated for joints, muscles, and tissues at a depth of a few centimeters. But for that, you need higher source intensities and larger irradiation areas—typically panels. The Aurora mask works on skin layers a few millimeters deep, not on joints or deeper muscles.

For pain and recovery: choose a panel from the Panacea range.

Potentially: superficial facial pain

Some users report relief from superficial facial pain, jaw tension, or mild sinus skin irritation while using the mask. This is plausible, as red and NIR light reaches the upper layers where these sensations often occur. We do not claim this as a primary function, but it is a welcome side effect for some users.

Not a substitute for medical care

For severe acne, rosacea, eczema, or other skin conditions, the first step is always a dermatologist. The Aurora mask is a supportive cosmetic device, not a medical treatment device.

How does this translate into results?

Cosmetic LED therapy works cumulatively. One session does not provide a lasting effect. Scientifically substantiated results usually appear after 4 to 12 weeks of consistent use (3-5 sessions per week of 10-20 minutes). An overview of LED applications in dermatology can be found in Barolet (2008) in Seminars in Cutaneous Medicine and Surgery.

What can realistically be expected:

• After 2-4 weeks: possibly a smoother skin feel, a slight glow, reduction of visible redness.
• After 4-8 weeks: improved skin texture, visible reduction of mild acne spots (when using Anti-Acne mode), more even complexion.
• After 8-12 weeks: softer lines, firmer feeling skin, improved overall skin quality.

Results vary per person. Factors such as age, skin type, lifestyle, and consistency of use all play a role.

Conclusion

In a market where mW/cm² numbers are often strategically manipulated to sound more impressive, we choose to be honest.

Our values:

• Measured with a spectrometer, not a solar meter.
• Measured on the LED surface, which is what your skin actually receives.
• Deliberately dosed for safe and comfortable direct skin contact.
• Scientifically within the effective range for cosmetic skin treatment.

The Aurora mask is not a "more is better" device. It is a precision instrument with the right dose for what it needs to do: support your skin in a safe, consistent, and scientifically sound way.

If you have any questions about the specific measurements, the test report, or which mode best suits your skin needs, please contact us at info@panacearedlight.com. We prefer to provide complete answers rather than inflated figures.

Scientific References

The studies listed below form the basis for our choices regarding wavelengths and dosages. This list is not exhaustive – the literature on photobiomodulation is growing rapidly.

• Papageorgiou, P., Katsambas, A., & Chu, A. (2000). Phototherapy with blue (415 nm) and red (660 nm) light in the treatment of acne vulgaris. British Journal of Dermatology, 142(5), 973-978. PubMed
• Wunsch, A., & Matuschka, K. (2014). A controlled trial to determine the efficacy of red and near-infrared light treatment in patient satisfaction, reduction of fine lines, wrinkles, skin roughness, and intradermal collagen density increase. Photomedicine and Laser Surgery, 32(2), 93-100. PubMed
• Lee, S. Y., Park, K. H., Choi, J. W., et al. (2007). A prospective, randomized, placebo-controlled, double-blinded, and split-face clinical study on LED phototherapy for skin rejuvenation. Journal of Photochemistry and Photobiology B: Biology, 88(1), 51-67. PubMed
• Russell, B. A., Kellett, N., & Reilly, L. R. (2005). A study to determine the efficacy of combination LED light therapy (633 nm and 830 nm) in facial skin rejuvenation. Journal of Cosmetic and Laser Therapy, 7(3-4), 196-200. PubMed
• Avci, P., Gupta, A., Sadasivam, M., et al. (2013). Low-level laser (light) therapy (LLLT) in skin: stimulating, healing, restoring. Seminars in Cutaneous Medicine and Surgery, 32(1), 41-52. PubMed
• Hong, S. R., Lee, J. M., Lim, H. W., et al. (2022). Irradiation with 590-nm yellow light-emitting diode light attenuates oxidative stress and modulates UVB-induced change of dermal fibroblasts. Experimental Dermatology, 31(6), 931-940. PubMed
• Ash, C., Dubec, M., Donne, K., & Bashford, T. (2017). Effect of wavelength and beam width on penetration in light-tissue interaction using computational methods. Lasers in Medical Science, 32(8), 1909-1918. PubMed