What is Colour Light Therapy? Would it be suitable for you? In my experience, patients in great pain from a flare up of endometriosis are understandably reluctant to do anything they fear may worsen the pain. Colour Light is the perfect nourishing start to a course of treatment to de-escalate the "fight or flight" response before proceeding forward with an invigorating clearing treatment, which may include needling, when they feel strong enough.