Device used to investigate the response characteristics of the visual reaction intensity of locusts stimulated by LED spectral light. LED spectral light, supplied by 12V DC adjustable power, was adjusted with PWM modulation system to keep constant. The stimulating intensity (100 lx and 1000 lx of UV, violet, orange light, respectively, and 10000 lx orange light), accept by the visual system of the investigated locust, was obtained through adjusting the supply voltage and the distance between light source and locusts visual system. The same light energy of UV, violet, orange light, stimulating the visual system, was obtained when power supply voltage was 12 V with the same power supply current. When the stimulating time reached, LED light source was closed and Ava Spec fiberoptic spectrometer system was opened immediately to record the response characteristics of the visual reaction intensity.