A new lantern test using light-emitting diode lamps

A lantern test using LED lamps has been devised. In this model, two lights each 4 mm in diameter placed 15 mm apart in tandem are presented for 2 seconds at a test distance of 5 m. The color of the light is either red (630 nm), green (555 nm), or yellow (580 nm). All possible combinations of three colors are included in one trial, which consists of nine pairs of lights. The color pairs are presented in random sequence and the number of errors in the second trial is scored. Test results are printed out.