This study was conducted to determine the effects of light intensity on the growth and development as well as the anthocyanin content of two Echeveria species, namely Echeveria agavoides and E. marcus. Three light intensity levels (high, 150 μmol･m-2s-1; intermediate, 75 μmol･m-2s-1; and low, 35 μmol･m-2s-1) served as the treatments, which were replicated four times. The results revealed that the tallest and largest plants were those under low light conditions. It was observed that there was a decline as the light intensity increased, which is attributed to the coping mechanisms of plants to search for light sources, which has a similar effect to bolting or an increase in the node-to-node distance. CIELAB color values of L* and a* for both species were significantly affected by the light intensity, indicating changes in the lightness of hue and green-to-red color pigmentation in plants. These results were strongly reflected in those of the anthocyanin content analysis, where a direct increase in the concentration was observed with increasing light intensity. The results of the anthocyanin analysis were also supported by the histogram, smart segmentation images, as well as the ratio of red and green pigments found in the images. Thus, a high light intensity should be used to increase the quality and provide conducive growing conditions for both succulent species.

Introduction
 Materials and Methods
  Planting materials
  Experimental design, treatments and growthconditions
  Hunter’s CIELAB
  Anthocyanin analysis
  Statistical analysis
 Results and Discussion
  Plant height and diameter
  Hunter’s CIELAB
  Anthocyanin analysis
  Image analysis
 References

• Raisa Aone M. Cabahug(Department of Environmental Horticulture, Sahmyook University, Natural Science Research Institute, Sahmyook University)
• Son Yil Soh(Department of Environmental Horticulture, Sahmyook University, Natural Science Research Institute, Sahmyook University)
• Sang Yong Nam(Department of Environmental Horticulture, Sahmyook University, Natural Science Research Institute, Sahmyook University) Corresponding author