SRM from EBC

The Standard Reference Model value (SRM)  was originally defined as beer color intensity on a sample free of turbidity and having the spectral characteristics of an average beer. The Bouguer-Beer-Lambert law later defined the SRM value as 12.7 rather than 10. The European Brewery Convention (EBC) system of color measurement is similar to the SRM. Measurements are taken at 430 nm in a 1 cm cell but the unit of color is 25 times the dilution factor times A₄₃₀ as opposed to 12.7 times the dilution factor times A₄₃₀.

This basically a conversion from the EBC factor to the SRM factor.