Kingbright l 7104 series 3mm infrared leds kingbright l 7104f3bt this 940nm ir led comes in a t 1 standard 3mm through hole package mechanically and spectrally matched to the phototransistor 55 9203 kingbright l 7104f3bt 3mm infrared led 940nm 12v 20ma 8mwsr blue trans 34