GENERATION, CONTROL, AND MEASUREMENT 



249 



Table 3-19. Relative Spectral Energy Distribution of a Standard 

 500-w Tungsten-filament Lamp with a Color Temperature of 285-4°K 



" Literature references (at end of Sect. 2) for data: column 2, Forsythe and Adams 

 (1945); column 3, Fowle (1929); column 4, Gibson (1949, p. 42) (reference at end of 

 this section), Skogland (1929); see also Sect. 2 under Thermal Sources. 



