Estimate the illuminance at the Earth€™s surface due to solar illumination when the Sun is 45⁰above the horizon. Use Equation (5.1), but approximate the function V(λ) shown in Figure 5.1 by a function that is 1 for λ  between 0.51 μm and 0.61 μm, and zero everywhere else. Compare your answer with Figure 5.18.

Figure 5.1

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0.8 0.6 0.4 0.2 400 450 500 650 750 550 600 700 Wavelength (nm) Relative luminous efficiency V