Future possibilities and limitations of light production

The symposium on limitations of light production at the winter meeting on January 29 was under the guidance of S. G. Hibben (M´45) Westinghouse Electric Corporation, Bloomfield, N. J., and chairman of the AIEE committee on the production and application of light. Papers and discussion dealt only with the visible spectrum. Mr. Hibben presented an illustration that a 30 to 1 ratio exists between possible and present lights based on the theoretical 100 per cent mechanical efficiency of 620 lumens per watt for a single spectral line at 5,560 angstroms.