They are complementary in my experience. Both lower inflammation. Red light increases energy and unbinds nitric oxide. However, I notice one distinct difference - I am able to achieve durable outcomes with ICES PEMF if I use it long enough on the ailment whereas red light therapy helped it feel better temporarily but didn’t drive a durable outcome. ICES PEMF definitely reaches greater tissue depth. I have made other posts on my experiences using both. With ICES PEMF, seems like the more I use it (min 8 hours a day) the better the outcome. Red light therapy has a biphasic response so I don’t go over 5-10min per use no more than twice a day for the red light devices (bulb, panel) I have based on their irradiance.
Also, red light therapy is great for boosting skin repair/ collagen production.