jo8 Tables 357-359 



TABLE 357. — Color Temperature, Brightness Temperature, and Brightness of Various 



Illuminants 



TABLE 358. — Temperature, Efficiency, and Brightness of Vacuum Lamps 



Lamp 



Lumens 

 per watt 



Maximum 



temperature, 



K. 



Maximum 

 brightness 

 candles/cm 2 



50- watt carbon . . . 



50- watt gem 



50- watt tantalum 

 10- watt tungsten . 

 25-watt tungsten . 

 40- watt tungsten . 

 60- watt tungsten . 



3 



4 



4 



7 



9 

 10 

 10. 1 



2115 

 2180 

 2160 

 2355 

 2450 

 2460 



2465 



55 



78 



53 



128 



193 

 206 

 211 



TABLE 359. — Temperature, Efficiency, and Brightness of Gas-Filled Tungsten Lamps 



Lamp 



Regular gas-filled lamps: 



50-vvatt 



75-watt 



1 00- watt 



200- watt 



300-watt 



500- watt 



1000-watt 



2000-watt 



Special lamps: 

 1000-watt stereopticon . 



ooo-watt movie 



10-kw 



30-kw 



Daylight lamps: 



200- watt 



500-watt 



Photographic: 



750- watt 



1500-watt 



Lumens 

 per watt 



10. 

 11. 8 

 12.9 



15-2 



16.3 



18. 1 



20.0 

 21.2 



24.2 



27-3 

 310 

 31.0 



10. o 



Maximum 



temperature, 



K. 



2685° 



2735 



2760 



2840 



2870 



2930 



2990 



3020 



3i8S 

 3290 

 3350 

 3350 



2860 

 2960 



3065 



3105 



Average 



color 



temperature, 



K. 



2670° 

 2705 

 2740 

 2810 

 2840 

 2920 

 2980 

 3000 



3175 

 3220 

 3300 

 3300 



Maximum 

 brightness of 



filament 

 candles/cm 2 



469 



S63 



605 



78l 



862 



iois 



1225 



1350 



2065 

 2660 

 3050 

 3050 



Smithsonian Tables 



