Understand the specs before you buy

What irradiance (mW/cm²) really measures, why the distance it is measured at changes everything, and how to compare panels fairly.

The difference between 660nm red and 850nm near-infrared light, what each is used for, and whether you want a combined panel.

The specs that actually matter when buying a red light panel - wavelengths, normalized irradiance, coverage, EMF, flicker, testing, and value.

What EMF and flicker mean on a red light panel spec sheet, why some buyers care, and how to check them.

Why distance is the biggest variable in red light therapy and how to use it to control the light that actually reaches you.

The trade-offs between full-size panels, handheld devices and LED masks, and how to match the form factor to your goal.