2 week old temperature

[free range possum]

We have 6 easter eggerthen chicks in a giant tote in our coop. Daytime temperatures are 85-90, we have turned their light off during the day. At night the low in the coop last night was 66 degrees. I have been turning on the light at night but even now at 9:30pm it is 86 degrees in the coop. When do you all think it is safe to leave their light off?

If you Are not sure, or have a schedule that you may not keep regular hours..then go to Austin Home Brewery and order a 2 stage temperature control switch. You plug it in to wall, then plug your heat lamp into heat side and a fan into cooling side and put probe in tote at about belly level of chicks. It will automatically turn a fan on or the heat as needed,. I am building a cabinet incubator and using the newer WiFi version of the older one running the other homemade incubator. Yes, incubator! Since it's for home brewing, it can also show the humidity. It's a Inkbird 308 temp switch.