oi8 Tables 314 and 315 



SPECTRAL ENERGY DISTRIBUTION AND LUMINOSITY DATA 



For use in computing light transmissions and relative brightnesses from spectrometric 

 data. Range of color temperatures 2000°K. to 3000°K. Considerably abridged from Skogland, 

 Bur. Standards, Misc. Publ., No. 86; see also No. 56, 1925, range, 1000 to 28ooo°K. 

 Planck's formula used with C 2 , 14330^ deg. The constant of Wien's displacement law has 

 been determined as 2886. 3m deg. 



TABLE 314. — Relative J x , based on J at \ — 0.59 M or 590 m^ 

 Example: At color temperature 2296°K. and X, 0.65//, the energy radiated relative to 

 that at 0.59M is 1.6361. 



in fi 2000°K. 2ioo°K. 2200°K. 2300°K. 2400°K. 2500°K. 26oo°K. 2700°K. 28oo°K. 2qoo°K. 30oo°K. 



.58 .8835 .8923 .9006 .9080 .9148 .9213 .9272 .9327 .9379 .9428 .9473 



.59 .00007 .00013 .0002 .0004 .0006 .0008 .0012 .0017 .0024 .0032 .0043 

 .60 1. 1256 I.II48 I.I05I I.O963 I.O885 1. 0810 I.O743 1. 068l I.0624 1. 0571 .0523 



.62 1.4044 L3657 



.64 1. 7195 1.6435 



.66 2.0698 1.9468 



.68 2.4534 2.2727 



.70 2.8679 2.6189 



.72 3.310 2.7986 



•74 3-777 3.360 



.76 4.265 3.748 



I-33I4 

 1-5773 

 1. 8410 

 2.1199 



2.4110 

 2.7120 

 3.020 

 3.332 



1.3009 

 1. 5193 

 1.7498 

 1.9895 



2.2361 

 2.4872 

 2.7403 

 2.9931 



1.2734 

 1.4680 

 1.6699 

 1.8770 



2.0869 

 2.2972 

 2.5068 

 2.7126 



1.2486 

 1.4223 

 1.5998 

 1.7792 



1.9584 

 2.1357 

 2.3095 

 2.4786 



1.2263 

 1.3815 

 1.5378 

 1.6934 



1.9965 

 2.1413 

 2.2801 



1.2060 

 1-3449 

 1.4824 

 1.6177 



1-7493 

 1-8757 

 1.9966 

 2.1105 



I- 1875 

 1.3114 

 1.4329 

 1.5505 



1.6633 

 1.7704 

 1. 8710 

 1.9647 



1. 1704 1. 1549 



1. 2812 1.2537 



1.3882 1.3479 



1.4905 1.4366 



1.5872 1. 5193 



1.6776 1.5955 



1. 7614 1.6648 



1.8380 1.7272 



TABLE 315. — Luminosity Relative to Maximum Value at Each Temperature 

 Example: At color temperature 268o°K. and X = 0.55,11, the luminosity relative to that 

 at 0.5720/u is 0.8874. 



Smithsonian Tables 



