In this paper, the result of study in artificial lighting uniformity ratio yield Irethod subjtrt to lecture room are reported. It is desirable that the aWication of equation $circled1 U=Ei/Ex imes100$ cannot be used to the rrean value in place to be efftrtive of light and darkness. And it is desirable that the awlication of equatioo $circled2 U=Ei/Ea imes100$ or equation $circled3 U=(Ea-Ei)/Ea imes100$ be used to the rrean Value equality illumination conditioos. Also, requiring preparation of judgarent standard, uniformity ratio equation agree with actual circumstances in this country. It must be considerai intensity of illumination and specificity of space in established standard.andard.