Journal of Biosystems Engineering

Korean Society for Agricultural Machinery (한국농업기계학회)
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Analysis of Spectral Light Intensity of High Pressure Sodium and Metal Halide Lamps for Plant Growth

식물생장용 고압나트륨램프와 메탈할라이드램프의 분광 광강도 분석

  • Lee, Hye-In (Dept. of Bioindustrial Machinery Engineering, Graduate School of Chonbuk National University) ;
  • Kim, Yong-Hyeon (Dept. of Bioindustrial Machinery Engineering, Chonbuk National University (Institute of Agricultural Science and Technology)) ;
  • Kim, Dong-Eok (Dept. of Agricultural Engineering, National Academy of Agricultural Science)
  • Received : 2010.10.22
  • Accepted : 2010.11.24
  • Published : 2010.12.25
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Abstract

Plant growth was greatly affected by the spectral distribution and light intensity of artificial lighting sources. In this study, the spectral characteristics of high power sodium (HPS) lamps and metal halide (MH) lamps produced by three different manufacturers were measured. Even though the spectral distribution of HPS lamps with lamp wattage of 250 W and 400 W was very similar, but the spectral light intensity by the manufacturers was different. Difference in the spectral light intensity of MH lamps by the manufacturers was increased with the increasing lamps wattage. Light intensity at the region of blue (B), green (G), red (R) and far-red (FR) light of HPS and MH lamps was also analyzed. HPS lamps showed the light intensity in order of R, FR, B and G light. The ratio of G, B, R and FR to photosynthetic photon flux (PPF) of HPS lamps with the lamp wattage of 250 W was 3.0-3.2%, 5.5-5.9%, 17.3-19.2% and 6.5-7.8%, respectively. For MH lamps, it showed the light intensity in order of R, FR, B, and G. The ratio of B, G, R, and FR to PPF of MH lamps with 250 W was 14.0-15.5%, 22.6-27.5%, 7.5-9.5% and 2.7-4.2%, respectively. HPS and MH lamps with 400 W had a relatively smaller ratio of R and FR to PPF than those with 250 W. HPS lamps showed that the ratio of light intensity of B and FR to R was 0.15-0.28 and 0.36-0.4, respectively. For MH lamps, the ratio of light intensity of B and FR to R was 1.26-2.72 and 0.27-0.56, respectively. From these results, it was concluded that the portion of blue light of MH lamps was higher than those of HPS lamps.

Keywords

References

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