I have a DIY LED build and my lights dim on and off, this is my schedule over my 180:
Blue lights start dimming on a 8AM and continue to go up until 10AM until they reach 90%. They stay on all day
White lights begin kicking on at 12PM and take about 60-90 minutes to get up to - 70%
White begin to dim at 6PM, and are completely off around 7PM
Blue's start dimming at 9PM, off at 10PM