Thermocouple cable off the steps inside the Lamp wires should be short because the outside air temperature at the cooler. If the cables Thermocouple inside Lamp too will probably affect the temperature value.
Now Thermocouple cables outside the Lamp should shortest line. The outside air temperature is cooler than if Thermocouple wires inside Lamp too, may affect reception of the temperature.
When the cables Thermocouple out outside and inside the Lamp line should be the shortest because of outside air temperature to cool. If Thermocouple line. In the Lamp too may affect the received temperature values.