“Red light therapy” describes a category of photobiomodulation devices, not one standardized machine. Two red light therapy beds may look similar while delivering different optical power at the skin. One may use red light, another may combine red and near-infrared wavelengths, and a third may offer multiple programs. Their treatment surfaces can also vary in size, spacing, cooling, and light distribution.
Session time is only one part of the exposure. The delivered dose is influenced by irradiance and duration, while the result also depends on wavelength and the distance between the light source and the body. A longer timer on a lower-output system is not automatically equivalent to a shorter timer on a higher-output system. This is why copying a number from an online post or another brand’s red light therapy device can produce an unsuitable protocol.
The intended goal matters as well. A bed used for general wellness is not necessarily operated like a targeted clinical device, and a cosmetic program may use different settings from a program designed for muscle comfort. The safest answer is therefore device-specific: follow the written instructions, then review your response before changing the schedule.
