LIGHT SOURCES 



uo 



120 

 100 

 80 

 60 

 AO 

 20 



6.000 



6,500 



4,000 4,500 5,000 5,500 



Figure 28.19 Relative spectral energy distribution curve for a 

 Mullard type B luminescent screen 



100 



30 



10 



30 



en 



10 



0-3 



0-1 



0-03 



0-01 



10 



20 

 t 



30 



40 

 sec 



Figure 28.20 Persistence characteristic curve for 

 Mullard type R luminescent screen 



353 



