SELIG HECHT 



379 



400 



yoo 



SOO 600 



Wai/e~ leo^ fh — ^jj 



Fig. 2. Energy distribution in the spectrum of the 400 watt lamp used in 

 conjunction with the light filters. 



TABLE I. 

 Relative Energy Transmitted by Wratten Light Filters Plus a 400 Watt Lamp. 



