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Ann Intern Med. 1938;11(10):1856-1860. doi:10.7326/0003-4819-11-10-1856
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Light therapy, both natural and artificial, is of definite value in the treatment of certain forms of tuberculosis. The clinically effective spectral regions are still to be defined; therapeutically, however, certain advantages are ascribed to sunlight as opposed to artificial sources of light, to one artificial source as against another and even to artificial sources as against the sun.

Empirical evidence still prevails, chiefly because the mode of action of light remains undefined. In the simplest photochemical effects, the physical processes are rarely understood and so the difficulties in biology and therapeutics are understandable. Not even upon the single cell


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