Biofeedback is a natural method that has been found to be helpful for many persons with migraine headaches, ADHD, epilepsy, stroke, anxiety, addictions, asthma, depression, hypertension, muscle spasms, sleep disturbance, chronic pain, stomach pain, stress, and other symptoms and conditions for both children and adults.
If the electric circuit is purely resistive, that is, a configuration of resistors only connected to a battery; the source energy continually gets dissipated entirely in the form of heat. This is known as the heating effect of electric current.
As LEDs heat up, the forward voltage drops (Figure 2) and the current passing through the LED increases. The increased current generates additional heating of the junction. If nothing limits the current, the junction will fail due to the heat. This phenomenon is referred to as thermal runaway.