Is it possible to misuse red light therapy devices?

Yes, it is entirely possible to misuse red light therapy devices, often driven by misconceptions or a desire to accelerate results. Misuse ranges from simple protocol errors to dangerous improvisations.
One common form of misuse is modifying devices. Some users attempt to remove safety filters or bypass timers to increase intensity, which can expose them to unsafe levels of NIR or potential electrical hazards.
Another dangerous trend is combining RLT with unverified substances. For example, applying industrial-grade DMSO or unknown "light-activating" gels before exposure can lead to severe chemical burns or systemic toxicity when driven into the skin by the light and heat.
Treating inappropriate areas is also a risk. While rare, there are anecdotal reports of users shining high-power lights directly into their eyes to "improve vision" without protection, risking retinal damage. Similarly, treating the abdomen extensively during pregnancy without medical oversight, despite the lack of proven harm, violates the precautionary principle.
Using damaged or counterfeit devices purchased from unregulated markets is a significant form of misuse. These devices may emit UV radiation, flicker at seizure-inducing frequencies, or lack proper insulation, posing fire and health risks.
Finally, ignoring pain signals. Some users push through burning sensations thinking it indicates "working deep," whereas pain is a clear signal to stop. Misuse essentially turns a safe, gentle therapy into a potential hazard. Education and sticking to manufacturer guidelines are the best defenses against these risky behaviors.