N.Y. GBS Law § 321

§ 321. Standard of illuminating power. The maximum illuminating power\nrequired and minimum illuminating power permitted of gas so furnished or\nsupplied in any such city shall be as follows: If a coal gas, sixteen\ncandles; if a mixed coal and water gas, eighteen candles; and if a\ncarburetted water gas, twenty candles. A candle shall mean a sperm\ncandle, six to a pound, burning at the rate of one hundred and twenty\ngrains of spermaceti per hour. The test for illuminating power shall be\nmade with gas obtained from a service pipe or main located at a distance\nof not less than one mile nor more than one and one-half miles from any\ndistributing holder, using, for coal gas and mixed coal and water gas\ncontaining more than fifty per centum of coal gas an F Argand burner,\nand for mixed coal and water gas containing fifty per centum and less of\ncoal gas and for carburetted water gas a number seven slit union Bray\nburner, on a basis of consumption of five cubic feet of gas per hour.\n