Photobiology is the study of light and its effect on living things. There has been a great deal of study on photobiology in the area of agriculture. The interest continues to grow because the science is becoming more refined and the marketplace is developing. Some random notes and an initial CRS Electronics fixture spectra is shown below.
McCree Curve: K. J. McCree (1970) studied and developed the action spectrum, absorption and quantum yield curves of photosynthesis in crop plants. The action spectrum is commonly known as the McCree Curve. McCree curve shows the relative photosynthesis response in the between 400-700 nm (commonly known as photosynthetically active region or PAR) for plants growth. This is also known as the generalized PAR curve. McCree also showed the relative quantum yield and relative absorption for 400-700nm region. This work has been the basis of all of the researches that followed until now.