TP1 (ceramic) = 25.0°C (measured)
TP2 (window) = 50.0°C (measured)
TP3 (window) = 47.0°C (measured)
QINCIDENT = 150W (measured)
QELECTRICAL = 6.2W
RMAX_ARRAY-TO-CERAMIC = 0.55°C/W
QARRAY = 6.2W + (150W × 0.40) = 66.2W
TMAX_ARRAY = 25.0°C + (66.2W × 0.55°C/W) = 61.4°C
TDELTA_MIN = [minimum of TP2 or TP3] –TMAX_ARRAY = 47.0°C – 61.4°C = –14.4°C