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Phototactic responses of Spodoptera litura adults to high-power light-emitting diodes (HPLEDs) were investigated at four different wavelengths, various light intensities, and lightexposure times under laboratory conditions. All light sources were significantly attractive to S. litura adults at 40 lx light intensity and 60 min light-exposure time; thus they were established as the optimal conditions. When the attraction rate of S. litura adults was surveyed at the optimal conditions, the green HPLED (520±5 nm)exhibited the highest potential attraction rate (64.3%), followed by the blue HPLED (470±10 nm, 47.7%), the yellow HPLED (590±5nm, 33.3%), and the red HPLED (625±10 nm). Compared to fluorescent light, which was used as a positive control (380–800nm, 50.0%), the green HPLED was approximately 1.3 times more effective at attracting S. litura adults. In conclusion, use of the green HPLED (520±5 nm) was the most suitable for attraction of S. litura adults under optimal conditions.