I mean... This light is over $250 and marketed as a reef light. Not as a 'soft coral pico tank' light.
Money spent does not mean much in this hobby
It is 16 led's, one is moonlight, one green, one red, now we are left with 13 leds.
You are left with even less if you don't run whites and blues at max. Many don't run all at max due to not liking the color, fan noise, wear and tear....
You could run your light from your 90 over your 15g cube...