I have week old chicks. I am using a 250w red bulb, the temp has been 93-99 depending on the time of day. How does one adjust the temp to decrease each week as they get older?? 10deg. lower per wk is about right?? Is there a thermostat or timer I should use? They are in a bathroom so there is not much for me to clip the light onto to raise it in increments. Now it is clipped to the vanity drawer which is slid open.