投光器の最大光度の推算法について

抄録

A method is hereby reported to compute briefly the maximum light intensity of the projector, with parabolic reflector or fresnel-lens and the source having nearly equal light-distribution in all dillections, and its beam is symmeti ical in relation to beam axis.
The mean light intensity in the beam angle, I_me, can be computed by means of the nomograph.(Fig.1.) And the maximum light intensity, I_ma can be obtained by multiplying I_me by K, the value of which proved to be generally approximately in this report.