The product of some experimentation with a Blinkstick Nano (https://www.blinkstick.com/).

blink_sandbox.py

from blinkstick import blinkstick
from matplotlib import cm, colors
from time import sleep

cmap = cm.get_cmap('coolwarm')

def getColor(n):
    colr = cmap(n)[0:3]
    outp = [x * .15 for x in colr]
    adj  = [x * .25 if x == max(colr) else x*.15 for x in colr]
    return colors.rgb2hex(colr), colors.rgb2hex(outp), colors.rgb2hex(adj)
    

bstick = blinkstick.find_all()[0]

for x in range(0, 11):
    bright, dark, adj = getColor(x/10)
    bstick.set_color(hex=adj)
    sleep(1)
    
bstick.turn_off()