Plot of the current after the first three up-going and last three down-going voltage steps for a 12 V, 15 W lamp.
Power as a function of temperature obtained with four different lamps.
Residuals after the fit on the four curves shown as examples in Fig. 2 .
Photographs of the filaments of lamp types 2 (top) and 3 (bottom).
Residuals after the fit with the reduced equation for low-power lamp types 7 and 8 and, for comparison, with the 2 W type 3.
Lamp type, manufacturer, number of samples, nominal power and voltage, and bulb diameter of the tested lamps.
Geometric g factors and errors for all lamps used in the experiment. nl : lamp number; W: nominal power (watts); V: voltage (volts); nr : number of measurements.
Results from least squares fit. nl : lamp number (type and sample); nm : number of measurements for each lamp and group of measurements; nominal V, W: lamp nominal voltage (V) and power (W); maximum V, W, K: the values of voltage (V), power (W), and filament temperature (K) at scan end; : rms value of the residuals after the fit; a, b, A, B: coefficients of Eq. (2) ; : the asymptotic standard errors obtained by the fit; : average standard deviation when results are averages of several measurements. Data in columns , a, b, A, B, and all columns are averages of the values obtained by measurement repetition.
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