Signal construct white led indicator lamps t55k wedge base signal construct medt5562 a white 12v t55k wedge based led lamp that is ideal as a replacement for both conventional and neon lamps the lamp contains an ultrabright 3mm led in a highly reflective plastic body that serves as a reflector there is an integrated resistor and protection diode that makes both ac and dc operation possible signal construct medt5562 white led indicator 12vdc t55k base