Infrared Saunas: A Comparative Analysis
Infrared Saunas A Comparative Analysis
The Relax Sauna Chip: Pure. Precise. Powerful.
At the heart of the Relax Sauna lies a breakthrough that separates it from every other infrared device on the market: its patented semiconductor chip—a pure, precise, and powerful FIR emitter engineered to match the natural resonant frequency of water molecules in the human body.
Not Ambient Heat—Targeted Biophysics
This is not ambient heat. This is targeted biophysics, tuned specifically to wavelengths between 4 and 14 microns, the precise infrared window where water, protein, and cellular structures absorb energy most efficiently. In this range, far infrared waves do more than warm you—they interact directly with your biology, supporting circulation, detoxification, mitochondrial activation, and systemic healing.
Unlike traditional saunas or generic “full spectrum” panels that scatter energy across broad, less effective bands, the Relax Sauna chip delivers near 100% FIR purity—with FDA-approved medical-grade output, consistent power density, and precise wavelength control. This means maximum biological resonance with minimal EMF interference or thermal noise.
It’s no accident that this frequency range is shared across humans, mammals, and birds—evidence of a natural window of biological communication. The Relax chip doesn’t try to mimic that frequency. It is that frequency. What follows is a detailed breakdown of the physics—measurable parameters like emissivity, radiant power, waveband filtering, and energy efficiency—that prove why this chip isn’t just superior. It’s in a class of its own.
This comparative analysis aims to provide a comprehensive understanding of the technical aspects of infrared light, with a focus on far infrared energy. Our goal is to demonstrate the effectiveness and superiority of Relax Saunas. We will explore the specific metrics used in applied physics to define the type, intensity, and safety of the infrared energy emitted by saunas.
Spectral Analysis
WAVELENGTH CLASSIFICATION
Spectral analysis measures the wavelength of light using a spectrometer. Light, like ocean waves, has its wavelength measured in microns or nanometers. Visible light ranges from about 400 to 700 nanometers. Infrared light starts right after visible red light, extending from about 700 nanometers to 1,400 microns and is categorized into Near Infrared (700 nanometers to 1.4 microns), Mid Infrared (1.4 to 3 microns), and Far Infrared (3 microns to 1 millimeter).
Wavelength Range by Sauna Type
| Sauna Type | Wavelength Range |
|---|---|
| Relax Sauna | 7–14 microns (100% far infrared) |
| Full Spectrum Sauna | 6 microns – 1.2 microns (8% far infrared, 37% mid infrared, 55% near infrared) |
| Amazon Sauna | 950 nanometers – 1.32 microns (100% near infrared) |
Discussion: As you can easily see, when it comes to far infrared, Relax is clearly superior with 100 percent of its wavelength in the exact therapeutic target desired for far infrared. This is to be expected with a semiconductor built to generate this exact wavelength.
Radiometric Measurement
TOTAL ENERGY OUTPUT
Radiometric measurement quantifies the total energy output of a light source—not just how bright it appears. Using tools like radiometers and bolometers, it measures radiant flux, or the total energy emitted per second in all directions, expressed in watts. This is a key metric for evaluating the true power and biological impact of infrared devices.
Radiant Flux Comparison
| Sauna Type | Radiant Flux (W) |
|---|---|
| Relax Sauna | 0.518 – 2.063 |
| Full Spectrum Sauna | 0.164 – 0.664 |
| Amazon Sauna | 0.122 – 0.556 |
Discussion: The Relax Sauna demonstrates superior energy emission, with even its lowest measure surpassing the highest values of its competitors.
Power Density Measurement
ENERGY INTENSITY AT THE BODY
Power density measurement is a critical measurement that most sauna companies hide. Power density assesses how intense the infrared radiation is at a specific point, typically measured in watts per square meter. The key metric here is irradiance, which tells you how much energy is delivered to a surface per unit area—critical for determining how effectively the energy can penetrate and interact with the body.
Power Intensity at 20 cm
| Sauna Type | Power Intensity (mW/cm² at 20 cm) |
|---|---|
| Relax Sauna | 5.18 – 20.63 |
| Full Spectrum Sauna | 1.64 – 6.64 |
| Amazon Sauna | 1.22 – 5.56 |
Discussion: The measurement range above describes the value recorded at one minute and ten minutes after start. Relax Sauna is significantly stronger in power intensity, providing 3× the strength of the full spectrum sauna and 4× that of Amazon. It’s important to note that the medical standard for therapeutic infrared power density is 20 watts per square meter—a threshold most devices struggle to reach. Relax Sauna hits this benchmark within just 3–4 minutes and consistently maintains it, delivering sustained therapeutic intensity where other systems fall short.
Far Infrared Emissivity Analysis
EFFICIENCY OF FIR EMISSION
Far infrared emissivity analysis evaluates how effectively a material emits FIR energy relative to a perfect emitter (a blackbody), which has an emissivity of 1.0. The higher the emissivity, the more efficient and targeted the infrared output.
Emissivity Range by Sauna Type
| Sauna Type | Emissivity Range |
|---|---|
| Relax Sauna | 0.85 – 0.95 |
| Full Spectrum Sauna | 0.80 – 0.90 |
Discussion: While emissivity does not measure power, Relax Sauna’s patented chip produces FIR with an emissivity over 0.9, meaning it emits nearly as efficiently as a blackbody—ensuring deep, consistent therapeutic impact that inferior panels can’t replicate. Note: The Amazon sauna had no far infrared waves detected; therefore, no far infrared emissivity.
Spatial Distribution
COVERAGE, ANGLE & UNIFORMITY
Spatial distribution examines how far infrared energy behaves across space. It includes intensity over distance (how energy decreases the farther you are from the source), angular distribution (how widely the energy spreads), and uniformity (how evenly it’s delivered across the body).
Spatial Performance by Sauna Type
| Sauna Type | Key Spatial Metrics |
|---|---|
| Relax Sauna | Intensity: 5.18 – 20.63 mW/cm² at 20 cm; Angular distribution: primarily forward-focused; Uniformity: high full-body coverage |
| Full Spectrum Sauna | Intensity: 1.64 – 6.64 mW/cm² at 20 cm; Angular distribution: significant spread across angles; Uniformity: moderate |
| Amazon Sauna | Intensity: 1.22 – 5.56 mW/cm² at 20 cm; Angular distribution: narrow beam, forward-focused; Uniformity: moderate |
Discussion: Relax Sauna excels in all three, providing consistent, full-body coverage without hot or cold zones—something most panels and mats fail to achieve.
Temporal Analysis
WARM-UP TIME & STABILITY
Temporal analysis tracks how quickly a sauna reaches and sustains its therapeutic temperature over time, typically measured with a bolometer. This reveals how stable and responsive the system truly is.
Time to Therapeutic Intensity
| Sauna Type | Time & Stability |
|---|---|
| Relax Sauna | Time to reach desired temperature: fast (5–10 minutes); Stability over time: high; Safe maintenance: excellent |
| Full Spectrum Sauna | Time to reach desired temperature: moderate (10–15 minutes); Stability over time: moderate; Safe maintenance: good |
| Amazon Sauna | Time to reach desired temperature: fast (5–10 minutes); Stability over time: high; Safe maintenance: very good |
Discussion: Relax Sauna reaches optimal far infrared intensity within minutes and maintains it consistently, ensuring uninterrupted therapeutic exposure—unlike many systems that spike and fade or require long warm-up times.
EMF Radiation
SAFETY & BACKGROUND EXPOSURE
EMF radiation analysis measures the levels of electromagnetic fields emitted by sauna components to ensure user safety and minimize biological disruption.
EMF Levels by Sauna Type
| Sauna Type | EMF Radiation (mG) |
|---|---|
| Relax Sauna | 0.9 – 0.17 |
| Full Spectrum Sauna | 8.7 – 2.4 |
| Amazon Sauna | 36.9 – 22.4 |
Discussion: Relax Sauna is engineered to produce ultra-low EMF, with readings far below typical cell phone, computer or household appliance exposure levels—offering powerful infrared therapy without compromising on safety or peace of mind.
Explore the Relax Far Infrared Line Up
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