My brooder is in our garage and I have a 250 watt heatlamp. The bulb in the heatlamp is sort of clear in the middle and red around the edges. Should I be turning off the light for a time each day, so that they have some darkness? As far as heat goes we have been in the 50's during the day and 40's at night, and our garage is not really insulated (but not drafty). My chicks are all between 1 to 2 weeks old. Thanks!