[newbie]addressing the RGB leds on the respeaker2

I’m trying to address the RGB leds on the respeaker2 (sitting on a rpi3) from within python:

When trying out the code below I get one led lighting up blue, but I can’t figure out how to switch it off. Can someone here help me further?

import spidev

import time

spi = spidev.SpiDev()

spi.open(0,1) #open device 1 on bus 0

resp = spi.xfer([0x00, 0x00, 0x00, 0x00])


resp = spi.xfer([0xFF, 0xFF, 0x00, 0x00])

kind regards,