In one example, a method for controlling temperature in a projection
device, comprises measuring a plurality of temperatures in the projection
device; averaging said plurality of temperatures to determine an averaged
temperature; determining an error between a set-point temperature and
said averaged temperature; and automatically adjusting a blower in said
projection device based on said determined error. In another example, a
method for controlling temperature in a projection device having a lamp
and a blower comprises measuring temperature in the projection device;
and selectively adjusting both a first signal to the blower and a second
signal to the lamp based on said measured temperature to control
temperature in the device.