most sites that sell cyan leds show wavelength is 505nm, 490 is aqua color.
led supply has them.
the best practical way to wire 120leds to be powered from li ion, is to wire all cells in paralel, and wire leds individually, same as paralel but with each led has it's own resistor, its value will be small since you only have only 1 li ion cell voltage vise, but you need few of them in parallel so drain of 3+a (120leds +resistors) wont drop the voltage too much.
there is no need for boost drivers, strings, kiss.