Comparative Analysis of All-Sky Luminous Efficacy Models Based on Calculated and Measured Solar Radiation Data of Four Worldwide Cities

Figure 2

Scatter plotting of diffuse solar radiation and luminous efficacy models performance for Lyon, France (1994).

(a) Solar irradiance—Z&H model (MBE: 6.4%, RMSE: 33.8%)

(b) Illuminance—Perez model (MBE: 0.3%, RMSE: 31.4%)