… and luminous intensity, 3.3 Irradiance and illuminance, 3.4 Radiance and luminance, 3.5 Radiant exitance and luminous … 3.10 Relationship between SI units and English units)4. Principles in Photometry and Radiometry, (4.1 Inverse square law, 4.2 Lamber's cosine law, 4.3 …