CRITERIA FOR EVALUATING THE EFFICIENCY OF RADIATION SOURCES FOR GREENHOUSES
Comparison of radiation sources always causes significant problems with respect to the comparative scale. Possible comparative standards are equal illumination E (for measurements related to “light”), equal illumination of PARs, the same density of photosynthetic photon flux PPFD (for measurements of plant growth), or even the same installed electric power Ru (for economic comparison ) Therefore, for each of these measurement tasks, you can determine the correct comparative scale. The problem is that choosing a comparative standard will have consequences for the result of the comparison. This is especially important for the selection of lamps for assimilation lighting.