Two instruments are described suited for recording thermoluminescent glow spectra respectively below and above room temperature. Their most remarkable property is the fact that the samples are kept under vacuum. Thermal insulation, thus, is good enough to allow samples to be placed only 15 mm from the light detector, even if they are heated up to 500 °C or cooled down to liquid N2temp. Consequently, the light collection efficiency turns out to be very high. These instruments are equipped with both analog and digital recorders, thus obtaining an accurate gathering of data.