EFFECTS OF HIGH-INTENSITY IRRADIATION 



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Fig. 4. Hyoscyamiis niger, cultivated in high-intensity spectral light 

 cabinets. Top figure (earlier experiment), R + I = red + infrared top 

 illumination, R = red pure, B -f R = blue + red top illumination, V = 

 "far blue." Bottom figure (more recent experiment, continuous light), 

 G = green, RB- = blue without near infrared + 2 red tubes + red glass 

 on top; RB+ = same, but blue + '~l% near infrared. The "far blue" 

 of the top figure is identical with the blue of the bottom figure. The 

 earlier blue had its maximum more toward the green than that used later 

 on and then designated as blue. 



