The projection system 1, wherein {HEAD ~ the active cooling arrangement} comprises {TAIL ~ a fan}, and the controller controls a speed of the fan, varying an amount of air flow the fan drives pass the solid state light source 
comprises
The projection system 1 , wherein { HEAD ~ the active cooling arrangement } comprises { TAIL ~ a fan } , and the controller controls a speed of the fan , varying an amount of air flow the fan drives pass the solid state light source
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH