FAQ | Wellness > Therapy Panel > Irradiance & Distance Measurements

As a refresher, the power density specs on the four (4) intensity level for the Red Light Therapy Panel are as follows:

• L1: 152mw/cm2
• L2: 183mw/cm2
• L3: 236mw/cm2
• L4: 283mw/cm2

These values were obtained using standard close-proximity testing, where the measurement sensor is positioned very near the panel surface.

— — —

The approach we took aligns with the industry norm for reporting maximum irradiance for light-therapy panels. In practice, this typically means placing the sensor between 0 cm and 1 cm from the panel, or “as close as reasonably possible” to the surface.

Using this testing method helps ensure:

• A consistent and comparable baseline for all intensity levels (L1–L4).

• Accurate comparison between the panel’s own modes.

• Elimination of variables like angle, distance, or ambient lighting that can affect readings at longer distances.

— — —

Because labs, equipment, and sensor mounting setups can differ slightly, there isn’t a single exact millimeter or inch value used across the board. What matters most is that all four intensity levels were measured using the same standardized approach, ensuring the values are reliable relative to one another.

Keywords: irradiance measurements, red light therapy panel, L1–L4 power density, close-proximity testing, mw/cm² readings, sensor distance 0–1 cm, light-therapy industry standard, maximum irradiance testing, consistent baseline measurement, light intensity comparison.