SOME EFFECTS OF HIGH-INTENSITY IRRADIATION 

 OF NARROW SPECTRAL REGIONS^ 



E. C. WASSINK, P. J. A. L. DE LINT, and J. BENSINK 



Laboratory of Plant Physiological Research, Agricultural University, 



Wageningen, Netherlands 



TECHNIQUES 



This paper reports the results of a study of formative effects of light of 

 narrow spectral regions on plants, when these plants are exposed only 

 to such light during the entire experimental period. In the majority of 



SCREEN 



TUBES 



CAS INLET 



CHOKES 



FILTERS 



Fig. 1. Schematic diagram of a light cabinet for growing plants ex- 

 clusively in light of restricted spectral composition. (Wassink and Stol- 

 wijk, 1952.) 



cases this requires high light intensities over large areas. To meet this 

 requirement, we built cabinets (Wassink and Stolwijk, 1952) about 

 1 m long, 30 cm wide, 70 cm high, with side walls and top of clear 

 glass, and with metal doors at both ends (Fig. 1 ). In the top and side 



^ Laboratory of Plant Physiological Research, Agricultural University, 

 Wageningen, 172nd Communication. 



Ill 



