Shanglaite Light Therapy Irrandce Test
What Is Irradiance?
Irradiance is the amount of light power delivered to a surface area.
In red light therapy, it is usually measured as:
mW/cm² (milliwatts per square centimeter)
In simple terms
Irradiance tells you how strong the light is when it reaches your body.
It answers the question:
“How much therapeutic light energy is actually delivered to the skin or tissue?”
Why Is Irradiance Important?
Red light therapy effectiveness depends on dose, not just wavelength.
Dose = Irradiance × Time
If irradiance is:
❌ Too low → Light may not reach therapeutic thresholds
❌ Too high → Can reduce effectiveness or cause discomfort
✅ Controlled & consistent → Optimal cellular response
That’s why irradiance matters as much as wavelength.
How Irradiance Works in the Body
When the correct irradiance is delivered:
● Light penetrates tissue efficiently
● Mitochondria absorb photons
● ATP (cellular energy) production increases
● Circulation and recovery processes are supported
● Without sufficient irradiance, these biological responses are weak or inconsistent.
Why Not Just “More Power”?
More power does not always mean better results.
Key reasons:
● Tissue has an optimal response window (biphasic dose response)
● Excessive irradiance can reduce effectiveness
● Uneven irradiance creates hot spots and poor coverage
● Uniform, measured irradiance is more important than raw wattage.
Why Irradiance Testing Is Needed
Reliable manufacturers test irradiance to:
● Verify real output (not just LED watt rating)
● Ensure consistent performance across the device
● Set safe and effective treatment times
● Support regulatory and professional standards
● This is why PPFD / irradiance testing is a key quality indicator.
(Actual values depend on distance, wavelength, and exposure time.)
| 3Typical Irradiance Ranges (At Skin Level) | |
| Application | Common Range |
| Skin & wellness | 10–40 mW/cm² |
| Muscle & joint support | 30–100 mW/cm² |
| Sports recovery / professional use | 60–150 mW/cm² |
Shanglaite Make Irradiance Let you know
● Wavelength tells you what the light does.
● Irradiance tells you how well it works.
● Both must be scientifically controlled to deliver safe, effective red light therapy.
Contact Shanglaite to get More About Red Light Therapy !
Email: sales@szsunled.com