When determining the necessity and quantity of supplemental light for a greenhouse, the calculation involves several factors. One must consider the average sunlight received throughout the year, often measured in Daily Light Integral (DLI), which can be obtained as monthly averages for any region. Additionally, the specific DLI requirements of the crop for optimal growth are crucial. By comparing months where the natural DLI falls below the optimal threshold, it becomes feasible to precisely calculate the supplemental light needed to attain the desired level. This calculation extends beyond simply adding light; it involves evaluating the potential increase in yield and assessing whether this increment justifies the investment in light fixtures and the associated energy costs. Therefore, the determination of supplemental lighting requirements is rooted in factors such as DLI targets, crop economics, and the anticipated payback period for the lighting investment.