1 candela hefner = 0.9 candela
A hefner candle is an obsolete German standard unit of luminous intensity equal to the luminous intensity of a standard Hefner lamp burning amyl acetate, and approximately equal to 0.9 candelas.
1 candela hefnercd Hf = 1*0.900000000 candelscd
1 candela hefnercd Hf = 1*0.90000000009 lumens per steradianlm/sr
1 candela hefnercd Hf = 1*0.86400000030413 candels Ukcd Uk