tuberider
Guest
Tell me what youse guys think about this, and yes I do know it is a small study with limited data, but the whole photosynthesis and spectrum thing is making me rethink PAR....
"The idea that the wavelength (color) of the light under which a coral has grown can influence some characteristic of the coral is not new. Kinzie and later Schlacher both have probed specific hypotheses is this general area of coral research. Seminal studies by Kinzie assessed coral skeletal growth rates under the influence of blue, red, green, and white growth lights for both Montipora verrucosa and Pocillopora damicornis (Kinzie, 1984). They concluded that these corals grew fastest under blue light, followed closely by white light, then green light, and finally the slowest growth was observed under red light. They followed up this study by measuring photosynthesis rates of Montipora verrucosa under these same lighting conditions (Kinzie, 1987). Once again, the highest photosynthesis rates were achieved under blue light; slightly lower but similar rates were observed for corals grown under both white light and green light, followed distantly by photosynthesis rates under red light. More recently, Schlacher et al. examined growth rates of Acropora solitaryensis under 150W metal halide bulbs rated at 5.5K, 10K, 14K, and 20K color temperatures (Schlacher, 2007). After 3 months of grow-out, the overall growth rates under the different bulbs were quite distinct: 6.2 mg/day at 5.5K, 4.9 mg/day at 10K, 8.5 mg/day at 14K, and 10.9 mg/day at 20K. Thus, the bulbs delivering the highest proportion of blue light (20K and 14K) promoted the highest growth rates. One concern clouds the interpretation of these results; the authors positioned all of the bulbs at the same height above the corals, leading to significant differences in the measured Photosynthetic Photon Flux Density (PPFD) delivered to the coral from each of these lamps. For example, the PPFD of the 20K lamp at the 400-450 nm spectral range of chlorophyll absorption is about 7.5 times greater than the PPFD of the 5.5K lamp at this same spectral range. The significance of these photon quantity differences on growth rate, independent of overall bulb "color", remains to be determined. The relationship between incident light color and consequent coral coloration, the topic of this essay, was considered by Riddle (Riddle, 2003). Using a brown Pocillopora meandrina as a test case, coral coloration was visually assayed after exposure of this SPS to focused light from either blue, red, green, yellow, or ultraviolet LED's over a period of greater than 7 weeks. The coral section irradiated by the blue LED turned from brown to pink, whereas the other colored lights either had no effect, or promoted coral bleaching. This limited investigation led to some intriguing speculation about the connection between growth light and coral color, and it sets the stage for the more extensive studies described below."
you can read the entire article here http://www.advancedaquarist.com/2008/3/aafeature1
Dammit I feel like I need to change my lighting again
"The idea that the wavelength (color) of the light under which a coral has grown can influence some characteristic of the coral is not new. Kinzie and later Schlacher both have probed specific hypotheses is this general area of coral research. Seminal studies by Kinzie assessed coral skeletal growth rates under the influence of blue, red, green, and white growth lights for both Montipora verrucosa and Pocillopora damicornis (Kinzie, 1984). They concluded that these corals grew fastest under blue light, followed closely by white light, then green light, and finally the slowest growth was observed under red light. They followed up this study by measuring photosynthesis rates of Montipora verrucosa under these same lighting conditions (Kinzie, 1987). Once again, the highest photosynthesis rates were achieved under blue light; slightly lower but similar rates were observed for corals grown under both white light and green light, followed distantly by photosynthesis rates under red light. More recently, Schlacher et al. examined growth rates of Acropora solitaryensis under 150W metal halide bulbs rated at 5.5K, 10K, 14K, and 20K color temperatures (Schlacher, 2007). After 3 months of grow-out, the overall growth rates under the different bulbs were quite distinct: 6.2 mg/day at 5.5K, 4.9 mg/day at 10K, 8.5 mg/day at 14K, and 10.9 mg/day at 20K. Thus, the bulbs delivering the highest proportion of blue light (20K and 14K) promoted the highest growth rates. One concern clouds the interpretation of these results; the authors positioned all of the bulbs at the same height above the corals, leading to significant differences in the measured Photosynthetic Photon Flux Density (PPFD) delivered to the coral from each of these lamps. For example, the PPFD of the 20K lamp at the 400-450 nm spectral range of chlorophyll absorption is about 7.5 times greater than the PPFD of the 5.5K lamp at this same spectral range. The significance of these photon quantity differences on growth rate, independent of overall bulb "color", remains to be determined. The relationship between incident light color and consequent coral coloration, the topic of this essay, was considered by Riddle (Riddle, 2003). Using a brown Pocillopora meandrina as a test case, coral coloration was visually assayed after exposure of this SPS to focused light from either blue, red, green, yellow, or ultraviolet LED's over a period of greater than 7 weeks. The coral section irradiated by the blue LED turned from brown to pink, whereas the other colored lights either had no effect, or promoted coral bleaching. This limited investigation led to some intriguing speculation about the connection between growth light and coral color, and it sets the stage for the more extensive studies described below."
you can read the entire article here http://www.advancedaquarist.com/2008/3/aafeature1
Dammit I feel like I need to change my lighting again
