Irradiance by Distance Chart

This chart plots the irradiance AWA publishes for the FX300 and FX500 panels at stated distances. Irradiance is the power arriving on each square centimeter, in mW/cm². It falls as you move away from the panel, and each panel has its own curve.

Information only. Not medical advice.

FX300 and FX500 irradiance by distance

AWA published irradiance by distance, FX300 and FX500 Line chart of irradiance in mW/cm² against distance in inches. FX300 is published from 1 to 12 inches, falling from 220 to 43.3. FX500 is published from 2 to 20 inches, falling from 220 to 58.6. A data table follows the chart. Values between published points are not measured. 0408012016020024002468101214161820 Distance from panel (inches) Irradiance (mW/cm²) FX500 at 2 inches: 220 mW/cm²FX500 at 3 inches: 197 mW/cm²FX500 at 4 inches: 149 mW/cm²FX500 at 5 inches: 121 mW/cm²FX500 at 6 inches: 94 mW/cm²FX500 at 7 inches: 91.1 mW/cm²FX500 at 10 inches: 81.4 mW/cm²FX500 at 12 inches: 73.8 mW/cm²FX500 at 15 inches: 70 mW/cm²FX500 at 20 inches: 58.6 mW/cm² FX500 FX300 at 1 inch: 220 mW/cm²FX300 at 2 inches: 145 mW/cm²FX300 at 3 inches: 116 mW/cm²FX300 at 6 inches: 83.5 mW/cm²FX300 at 12 inches: 43.3 mW/cm² FX300

Values between points are not measured. The lines join the published points only to help your eye. They are not extra data. Hover over or tab to a marker to see its value.

Data table

AWA published irradiance in mW/cm² by distance
Distance FX300 (mW/cm²) FX500 (mW/cm²)
1 inch 220 Not published
2 inches 145 220
3 inches 116 197
4 inches Not published 149
5 inches Not published 121
6 inches 83.5 94
7 inches Not published 91.1
10 inches Not published 81.4
12 inches 43.3 73.8
15 inches Not published 70
20 inches Not published 58.6

Source: the AWA irradiance specs guide. "Not published" means AWA has not published a figure at that distance for that panel. It does not mean zero.

How to read the chart

  • Always read a number together with its distance. 220 mW/cm² is a figure at a short distance, not a general rating.
  • The two panels have different curves. At 6 inches the published figures are 83.5 for the FX300 and 94 for the FX500. At 12 inches they are 43.3 and 73.8.
  • Do not compare one brand's figure at 2 inches with another brand's figure at 12 inches.
  • Published figures are stated at specific points. Readings at the edge of a panel can differ, and so can readings from your own meter.
  • Use the distance in your device manual. A table or chart is not a session recommendation.

Turn irradiance into energy

Energy in J/cm² equals irradiance in mW/cm² times seconds, divided by 1000. Try it with the red light dose calculator, or see the grid of example numbers in the session time table.

Related guides

How we create this guide

AWA sells red light therapy devices. We build these tools and guides to explain how devices work and how to choose and use one. The numbers come from AWA product pages and our published irradiance specs. This is general information, not medical advice. Read each product page and label. See our editorial standards.

Updated October 2026.

Information only. Not medical advice.