A method using light energy to excite brain waves and method using the same employ a light-power light source module in collaboration with a control module to apply a non-intrusive light energy stimulation at a specific frequency to users skin so as to generate potential variation of brain wave of users. The device can be operated at different frequencies to stimulate nerves under skin and further affect the potential of brain waves, thereby improving functional imbalance such as anxiety, tension, uneasiness and insomnia.
