... the eye strain which the light causes. 3rd,the intelligent recgnition,the student lowers the head the near sihgtedness,sends ... the attention nearsihgtedness automatically warns the sound ,the automatic pass lamp, froces the student to gain ground ,The student gains ... convenient. 10th,the electricity saving is incandecent lamp 6 times, conserves energy the lamp 3 times ,life special skill. Please ...