In the results of investigating the role of LED light quality in enhancing the ornamental value of indoor foliage plants, amber and red light increased plant height, leaf width, and leaf stalk, and the consequent tree shape decreased the ornamental value. The chlorophyll content increased significantly under white light and compound light. With regard to the effect of plant leaf color on ornamental value, the value of lightness was markedly enhanced by red light. As to the functionality of plants according to photosynthetic activity, plants such as Dieffenbachia, Clusia, and Dracaena were found favorable to those staying indoors for a longtime from morning to evening. Spathiphyllum, and Ficus were found to be recommendable for indoor spaces used actively during afternoon because their photosynthesis was activated in the afternoon. With regard to power consumption according to light quality, white light consumed 119 W/hour, around 45% lower than that of fluorescent lamps, so it is considered the optimal artificial light quality that can enhance energy efficiency. Red light consumed 72 W/hour, only 33% of that of fluorescent lamps, but it was not considered the optimal light quality because plant growth was poor under the light quality. White light and compound light were found to be the ideal light sources for improving the functionality and ornamental value of indoor plants and reducing the cost of maintenance, but because compound light hinders people from recognizing the original color of plants and makes their eyes easily tired, white light was considered the optimal light satisfying all of the ornamental value, economic efficiency and functionality resulting from plant growth.
Bark, S. Y., Chang, M. S., Choi, J. H., Kim, B. S., Lee, H. R., Ham, K. H., 2007, Effect of a Refrigeratio with LED on Functional Composition Changes and Freshness Prolongation of Cabbage, Korea Food Marketing Association, 14(2), 113-118.
Brown, C. S., Schuerger, A. C., Seger, J. C., 1995, Growth and photom orphogenesis of plants under red light emitting diodes with supple mental blue or for red lighting, J. Amer. Soc., Hort. Sci., 120, 808-813.
Chory, J., Chatterjee, M., Cook, R. K., Elich, T., Fankhauser, C., Li, J., Nagpal, P., Neff, M., Pepper, A., Poole, D., Reed, J., Vitart, V., 1996, From seed germination to flowering, light controls plant development via the pigment phytochrome, Poc. Nalt. Acad. Sci., 93, 12066-12071.
Heo, J. W., Lee, C. W., Chakrabarty, D., Paek, K. Y., 2002, Growth Responses of Marigold and salvia bedding plant as affected by a light Emitting diode, Plant Growth Regulation, 38, 225-230.
Hssiao, T. C., Allaway, W. G., 1973, Action spectra for guard cell Rb uptake and stomatal opening in viciafaba, Plant Physiol, 51, 82-88.
Kim, Y. H., Park, H. S., 2003, Graft taking characteristics of watermelon grafted seedlings as affected by blue, red and for red light emitting diodes, J. Kor. Soc. Agri., 28(2), 151-156.
Laura, L. M., Robert, P. R., 1980, Practical horticulture, Prentice Hall, Co., New Jersey, 316.
Lee, J. G., Oh, S. K., Cha, S. H., Jang, Y. A., Kim, S. Y., Um, Y. C., Cheong, S. R., 2010, Effects of Red blue light ratio and short term light zonality conversion on growth and anthocyanin contents of baby leaf lettuce, Journal of Bio-Environment Control, 19(4), 351-359.
Miyashita, Y. K., Kozai, T., Kimura T., 1995, Effect of red and Far red light on the growth and morphology of potato plants in vitro: Using light emitting diodes as a light source for micro propagation, Acta Hort., 393, 710-715.
Okamoto, K., Yanagi, T., Takita, S., Tanaka, M., Higuchi, T., Ushida, Y., Watanabe, H., 1996, Development of plant growth apparatus using blue and red LED as artificial light source, Acta Horticulture, 440, 111-116.
Park, S. H., Lee, Y. B., Bea, G. Y., Kondo, M., 1998, Anion evolution in plants and its involved factors, J. Kor. Soc. Hort. Sci., 39(1), 115-118.
Saebo, A., Krekling, T., Appelgren, M., 1995, Light quality affects photosynthesis and leaf anatomy of brich plantlets invitro, Plant cell Tissue and Org. Cult., 41, 177-185.
Snyder, S. D., 1990, Building interiors plants and automation prentice hall englewood cliffs, N. J., USA, 5-29.
Sung, I. K., Takano, T., 1997, Effects of supplemental blue and red lights in the morning twilight on the growth of physiological responses of cucumber seedlings, Environ. Control in Biol., 35(4), 261-266.
Wolverton, B. C., Wolverton, J. D., 1993, Plants and soil microorganism: Removal of formaldehyde, xylene and ammonia from the indoor environment, J. Miss. Aca. Sci., 38, 11-15.
Yanagi, T., Okamoto, K., Takita, S., 1996, Effects of blue, red and blue red light of two different PPF levels on growth and morphogenesis of lettuce plants, Acta. Hort., 440, 117-122.