Theory and the present state of the investment optimization of the illumination system

摘要

Profit optimization theory as a function of investment of the optical equipment is proposed. Since the power cost due to the illumination plays a vital role in the economic management of the plant factory, a unified analysis as a function of the optical investment is formulated. The fixed as well as the variable costs are discussed in terms of investment of optical devices for a generalized theory of the plant factory. Condition of the maximized profit quantitatively agrees with the practical experience The result indicates how the optical power efficiency as well as the investment efficiency should be improved. Also, other variable costs than of the electric power should simultaneously be considered in a total systematic design. Discussion on the color rendering property of lamps is also added, to suggest that the conventional PPFD concept may not be sufficient in practice.