Pub Date : 2015-11-01DOI: 10.1109/SSLCHINA.2015.7360697
Ting Wang, Xiansong Fu, Jun Ma, Teng Zhan, Qinjin Wang, X. Yi, Guohong Wang, Jinmin Li
In this paper, we investigated the impact of impedance matching network on transmission efficiency in LED novel driving system based on wireless power transfer (WPT) technology, which has the capability of transfer electrical power from a power source to an electrical load without any interconnecting wires. In order to improve the power transfer ability of the WPT system, the impedance matching technology was introduced in this work, and a magnetic coupling resonance system was applied to the wireless driving LED lighting system. Due to the flexibility of matching network, the π-type L-type matching networks were chosen for source and load side, respectively. With the help of Smith Software the value of the matching network can be calculated directly. To confirm the effect of the impedance matching circuit on the LED novel driving system, an actual circuit was verified. The experiment results show that the efficiency of WPT technology drive LED lighting system can be improved from 40% to 85%. We believe that the WPT technology drive LED lighting system will make these LED lighting products more available, portable. This new technology will also gain more and more attention in the global LED lighting market.
{"title":"Analysis of impedance matching network on LED novel driving system based on the wireless power transfer","authors":"Ting Wang, Xiansong Fu, Jun Ma, Teng Zhan, Qinjin Wang, X. Yi, Guohong Wang, Jinmin Li","doi":"10.1109/SSLCHINA.2015.7360697","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360697","url":null,"abstract":"In this paper, we investigated the impact of impedance matching network on transmission efficiency in LED novel driving system based on wireless power transfer (WPT) technology, which has the capability of transfer electrical power from a power source to an electrical load without any interconnecting wires. In order to improve the power transfer ability of the WPT system, the impedance matching technology was introduced in this work, and a magnetic coupling resonance system was applied to the wireless driving LED lighting system. Due to the flexibility of matching network, the π-type L-type matching networks were chosen for source and load side, respectively. With the help of Smith Software the value of the matching network can be calculated directly. To confirm the effect of the impedance matching circuit on the LED novel driving system, an actual circuit was verified. The experiment results show that the efficiency of WPT technology drive LED lighting system can be improved from 40% to 85%. We believe that the WPT technology drive LED lighting system will make these LED lighting products more available, portable. This new technology will also gain more and more attention in the global LED lighting market.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126301203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/SSLCHINA.2015.7360706
Shiqi Zheng, Ronnier M. Luo, M. Ye
The main goal of the present study was to compare the impact of dynamic and static light on work performance and means of different measures of alertness. Ten participants experienced four sessions. Each session had a different lighting: 6000K static light, 9000K static light, CCT- low-frequency dynamic light (cycle = 4 hours, CCT between 6000 and 12000 K) and CCT- high-frequency dynamic light (cycle = 2 hours, CCT between 6000 and 12000 K). Each session lasted 5.5 hours. Altogether, 12 testing methods were used and they can be divided into four categories: questionnaire, task performance, physiological methods and biochemical methods. The present results suggest that dynamic light generated a higher alertness than static light, and CCT-high-frequency dynamic light had a stronger impact than that of low frequency CCT-dynamic light.
{"title":"The effect of dynamic light on human alertness","authors":"Shiqi Zheng, Ronnier M. Luo, M. Ye","doi":"10.1109/SSLCHINA.2015.7360706","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360706","url":null,"abstract":"The main goal of the present study was to compare the impact of dynamic and static light on work performance and means of different measures of alertness. Ten participants experienced four sessions. Each session had a different lighting: 6000K static light, 9000K static light, CCT- low-frequency dynamic light (cycle = 4 hours, CCT between 6000 and 12000 K) and CCT- high-frequency dynamic light (cycle = 2 hours, CCT between 6000 and 12000 K). Each session lasted 5.5 hours. Altogether, 12 testing methods were used and they can be divided into four categories: questionnaire, task performance, physiological methods and biochemical methods. The present results suggest that dynamic light generated a higher alertness than static light, and CCT-high-frequency dynamic light had a stronger impact than that of low frequency CCT-dynamic light.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129937633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/SSLCHINA.2015.7360708
Chun Jin, H. Noguchi, Jingjing Qiu, Hao Wang, Yaojie Sun, Yandan Lin
This study aims to investigate the effect of combination of color accent light and white ambient light on the people's preference for living room considering the activities. 60 observers participated the two parts of the study. A psychophysical evaluation experiment was conducted to examine the effects of various illumination settings on preference for the lighting room depending on 5 specific activities. The various illumination setting were characterized by 3 levels of correlated color temperature (CCT) of main light, 3 levels of illumination of main light and 7 colors of upper light. The results showed that people preferred different illuminance settings depending on the activities. And the best light setting were listed.
{"title":"The effect of color light combination on preference for living room","authors":"Chun Jin, H. Noguchi, Jingjing Qiu, Hao Wang, Yaojie Sun, Yandan Lin","doi":"10.1109/SSLCHINA.2015.7360708","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360708","url":null,"abstract":"This study aims to investigate the effect of combination of color accent light and white ambient light on the people's preference for living room considering the activities. 60 observers participated the two parts of the study. A psychophysical evaluation experiment was conducted to examine the effects of various illumination settings on preference for the lighting room depending on 5 specific activities. The various illumination setting were characterized by 3 levels of correlated color temperature (CCT) of main light, 3 levels of illumination of main light and 7 colors of upper light. The results showed that people preferred different illuminance settings depending on the activities. And the best light setting were listed.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122222554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/SSLCHINA.2015.7360710
Y. Wang, X. Zhong, Chun Zhang, Y. Tu
Nowadays, since visual display terminals have been widely used in office for all day work, the research on the effect of long time work is still insufficient. In addition, the impact of LED light source for all day work is not clear. In this paper, the visual fatigue caused by long-term VDT work under LED luminaires with 300lux illuminance level was investigated through subjective questionnaire and ophthalmological parameters. The results showed that all the subjective symptoms got severer with increasing working time. Ophthalmological parameters of NPA, CFF, BUT, BCDVA and BCNVA were significantly influenced by working time under LED luminaires. The NPC, PRA and NRA were not significant influenced by working time under LED luminaires. The ophthalmological parameters NPC, CFF, BCDVA, BCNVA and PRA showed close relationship with the subjective state of visual fatigue.
{"title":"Change of subjective and ophthalmological fatigue during long-term VDT work","authors":"Y. Wang, X. Zhong, Chun Zhang, Y. Tu","doi":"10.1109/SSLCHINA.2015.7360710","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360710","url":null,"abstract":"Nowadays, since visual display terminals have been widely used in office for all day work, the research on the effect of long time work is still insufficient. In addition, the impact of LED light source for all day work is not clear. In this paper, the visual fatigue caused by long-term VDT work under LED luminaires with 300lux illuminance level was investigated through subjective questionnaire and ophthalmological parameters. The results showed that all the subjective symptoms got severer with increasing working time. Ophthalmological parameters of NPA, CFF, BUT, BCDVA and BCNVA were significantly influenced by working time under LED luminaires. The NPC, PRA and NRA were not significant influenced by working time under LED luminaires. The ophthalmological parameters NPC, CFF, BCDVA, BCNVA and PRA showed close relationship with the subjective state of visual fatigue.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124782032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/SSLCHINA.2015.7360707
Yanrong Pei, P. Lu, Hua Yang, Jing Li, Junxi Wang, Jinmin Li
This paper studies a new type of solar spectral fitting technique based on LED. Firstly, Using the light collecting equipment collected several typical periods of the solar spectrum of Beijing. And then, After a preliminary analysis, five specific bands LEDs are used to fit the target solar spectrum. Among them, the use of two pieces of normal white light LEDs, a single LED with 480nm wavelength, a single LED with 500nm wavelength, and a single LED coated red fluorescent powder emitting 650nm light. To sum up, through the five different bands LEDs fitting the solar spectrum of Beijing, light is more soft, eye viewing is more comfortable; Compared with the acquisition of the solar spectrum, fitting degree reached 98%, total power 3.5-3.8w, light efficiency is about 100lm / w, color rendering index (CRI) is about 85.
{"title":"New solar spectral fitting technique based on LED","authors":"Yanrong Pei, P. Lu, Hua Yang, Jing Li, Junxi Wang, Jinmin Li","doi":"10.1109/SSLCHINA.2015.7360707","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360707","url":null,"abstract":"This paper studies a new type of solar spectral fitting technique based on LED. Firstly, Using the light collecting equipment collected several typical periods of the solar spectrum of Beijing. And then, After a preliminary analysis, five specific bands LEDs are used to fit the target solar spectrum. Among them, the use of two pieces of normal white light LEDs, a single LED with 480nm wavelength, a single LED with 500nm wavelength, and a single LED coated red fluorescent powder emitting 650nm light. To sum up, through the five different bands LEDs fitting the solar spectrum of Beijing, light is more soft, eye viewing is more comfortable; Compared with the acquisition of the solar spectrum, fitting degree reached 98%, total power 3.5-3.8w, light efficiency is about 100lm / w, color rendering index (CRI) is about 85.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116548280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/SSLCHINA.2015.7360715
Yan Shen, Jianxing Shen, Sima Dimitrijiev, Jisheng Han, Xiangang Xu
Indium-tin-oxide (ITO) films are widely applied as the transparent conductive layers in light emitting diodes and solar cells. In this paper, ITO nanowiskers have been obtained by controlling the oxygen flow in the process of evaporation by electron-beam evaporation technique. ITO nanowiskers appeared for specific vapor-liquid-solid (VLS) growth conditions in the process. Nanowisker ITO films were analyzed by SEM, AFM, and ultraviolet-visual spectrometer. The films exhibit rough surface morphology with excellent transparent current spreading.
{"title":"Characteristics of indium-tin-oxide nanowiskers grown by vapor-liquid-solid growth method and electron-beam evaporation technique","authors":"Yan Shen, Jianxing Shen, Sima Dimitrijiev, Jisheng Han, Xiangang Xu","doi":"10.1109/SSLCHINA.2015.7360715","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360715","url":null,"abstract":"Indium-tin-oxide (ITO) films are widely applied as the transparent conductive layers in light emitting diodes and solar cells. In this paper, ITO nanowiskers have been obtained by controlling the oxygen flow in the process of evaporation by electron-beam evaporation technique. ITO nanowiskers appeared for specific vapor-liquid-solid (VLS) growth conditions in the process. Nanowisker ITO films were analyzed by SEM, AFM, and ultraviolet-visual spectrometer. The films exhibit rough surface morphology with excellent transparent current spreading.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134354587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/SSLCHINA.2015.7360716
Xuejian Xie, Yan Peng, Longfei Xiao, Xiaobo Hu, Xiangang Xu
6H-SiC single crystals with different aluminum doping concentrations were grown by physical vapor transport (PVT) method. Al2O3 powder was used as Al source during the growth and was put into a small crucible to avoid the rapid depletion of aluminum source. The incorporation of Al atoms and electrical properties of p-type 6H-SiC were characterized by secondary ion mass spectroscopy (SIMS) and Hall measurements in Van-der-Pauw configuration, respectively. Results showed that the maximum hole concentration in aluminum concentration of 4×1018 cm-3 was 1.3×1017 cm-3 with Hall mobility of 24.8 cm2/V·S and resistivity of 1.89 Ω·cm. The resistivities of samples were investigated in detail by a noncontact resistivity testing system and an innovative contactless resistivity measurement system at room temperature. Results showed that the minimum resistivity of 855 mΩ·cm was obtained at the center region of one wafer with the aluminum content of 4×1018 cm-3. In addition, the resistivity distributions along the growth direction and the radial direction were discussed.
{"title":"Investigation of electrical properties of P-type 6H-SiC bulk crystal","authors":"Xuejian Xie, Yan Peng, Longfei Xiao, Xiaobo Hu, Xiangang Xu","doi":"10.1109/SSLCHINA.2015.7360716","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360716","url":null,"abstract":"6H-SiC single crystals with different aluminum doping concentrations were grown by physical vapor transport (PVT) method. Al<sub>2</sub>O<sub>3</sub> powder was used as Al source during the growth and was put into a small crucible to avoid the rapid depletion of aluminum source. The incorporation of Al atoms and electrical properties of p-type 6H-SiC were characterized by secondary ion mass spectroscopy (SIMS) and Hall measurements in Van-der-Pauw configuration, respectively. Results showed that the maximum hole concentration in aluminum concentration of 4×10<sup>18</sup> cm<sup>-3</sup> was 1.3×1017 cm<sup>-3</sup> with Hall mobility of 24.8 cm<sup>2</sup>/V·S and resistivity of 1.89 Ω·cm. The resistivities of samples were investigated in detail by a noncontact resistivity testing system and an innovative contactless resistivity measurement system at room temperature. Results showed that the minimum resistivity of 855 mΩ·cm was obtained at the center region of one wafer with the aluminum content of 4×10<sup>18</sup> cm<sup>-3</sup>. In addition, the resistivity distributions along the growth direction and the radial direction were discussed.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"58 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116544864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/SSLCHINA.2015.7360701
Xiaoru Xu, Huiqiang Chen, B. You, Xiaobo Wu
Light emmiting diode (LED) lighting is becoming more and more popular in both commercial and residential lighting system for its energy-efficiency and environmental-friendly merits. For high end lighting system, dimming and color control are always required, which are known as smart lighting. In this paper, a cost-effective power factor corrected (PFC) flyback pre-regulator is presented for smart lighting application. To reduce system cost, it adopts primary side regulation (PSR) control, thus eliminates secondary side output sensing and opto-coupler in conventional isolated flyback PFC control circuitry. For PSR control, the output voltage is reflected to the auxiliary winding only during the secondary side diode conducting period. It is difficult to sense the output voltage when the secondary side diode conduction time is short, even more difficult during the light load and valley of input voltage. Adaptive blanking time (ABT) control is proposed to avoid fault sensing and keep precise output regulation under those circumstances. A 36w demonstration board with this control method was built. Test results showed that output voltage regulation is better than that without ABT control. Power factor (PF) of 0.96 and 7.6% of total harmonic distortion (THD) under 220V rms input, and PF of 0.99 and THD of 11.2% under 110V rms has been achieved. With the proposed idea, the IEC61000-3-2 THD control standard for lighting system is implemented in a low-cost way.
{"title":"Power factor corrected primary side regulated flyback controller for smart LED lighting system","authors":"Xiaoru Xu, Huiqiang Chen, B. You, Xiaobo Wu","doi":"10.1109/SSLCHINA.2015.7360701","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360701","url":null,"abstract":"Light emmiting diode (LED) lighting is becoming more and more popular in both commercial and residential lighting system for its energy-efficiency and environmental-friendly merits. For high end lighting system, dimming and color control are always required, which are known as smart lighting. In this paper, a cost-effective power factor corrected (PFC) flyback pre-regulator is presented for smart lighting application. To reduce system cost, it adopts primary side regulation (PSR) control, thus eliminates secondary side output sensing and opto-coupler in conventional isolated flyback PFC control circuitry. For PSR control, the output voltage is reflected to the auxiliary winding only during the secondary side diode conducting period. It is difficult to sense the output voltage when the secondary side diode conduction time is short, even more difficult during the light load and valley of input voltage. Adaptive blanking time (ABT) control is proposed to avoid fault sensing and keep precise output regulation under those circumstances. A 36w demonstration board with this control method was built. Test results showed that output voltage regulation is better than that without ABT control. Power factor (PF) of 0.96 and 7.6% of total harmonic distortion (THD) under 220V rms input, and PF of 0.99 and THD of 11.2% under 110V rms has been achieved. With the proposed idea, the IEC61000-3-2 THD control standard for lighting system is implemented in a low-cost way.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129291945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/SSLCHINA.2015.7360699
Yuan Gao, Haining Wu, Jianfei Dong, G. Q. Zhang
Color temperature is one of the most significant characteristics for light sources due to its influence on human visual perception, circadian rhythm, emotion, work efficiency, and etc. Currently, it is common for LED light sources to render or tune color temperatures by mixing various color LEDs with different intensity. Existing methods can hardly take into consideration all the lighting requirements, including power consumption, luminous flux, spectrum components, and etc. In this paper, we first make a brief introduction on the significance of color temperature and emphasize the hazard of excess blue light. Then an optimization algorithm of light chromaticity is proposed for the design and control of LED light sources based on linear programming. Objective functions and constraints are described in details. In the optimal color rendering design, we simultaneously restrain the luminous flux, color temperature and the spectrum components of blue light. An example of LED light source design is taken to verify our approach. Results show that the proposed algorithm is able to fulfill the requirement of color temperature, while maintaining satisfied photometric and electrical performance comparing with conventional methods. The optimization algorithm is suitable for both color temperature control and rendering color light with targeted spectral components.
{"title":"Constrained optimization of multi-color LED light sources for color temperature control","authors":"Yuan Gao, Haining Wu, Jianfei Dong, G. Q. Zhang","doi":"10.1109/SSLCHINA.2015.7360699","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360699","url":null,"abstract":"Color temperature is one of the most significant characteristics for light sources due to its influence on human visual perception, circadian rhythm, emotion, work efficiency, and etc. Currently, it is common for LED light sources to render or tune color temperatures by mixing various color LEDs with different intensity. Existing methods can hardly take into consideration all the lighting requirements, including power consumption, luminous flux, spectrum components, and etc. In this paper, we first make a brief introduction on the significance of color temperature and emphasize the hazard of excess blue light. Then an optimization algorithm of light chromaticity is proposed for the design and control of LED light sources based on linear programming. Objective functions and constraints are described in details. In the optimal color rendering design, we simultaneously restrain the luminous flux, color temperature and the spectrum components of blue light. An example of LED light source design is taken to verify our approach. Results show that the proposed algorithm is able to fulfill the requirement of color temperature, while maintaining satisfied photometric and electrical performance comparing with conventional methods. The optimization algorithm is suitable for both color temperature control and rendering color light with targeted spectral components.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127619021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/SSLCHINA.2015.7360712
Roy C. Y. Chen, Houcheng Liu, Shiwei Song, Guangwen Sun, R. Chen
The effects of light quality on growth and quality of lettuce in hydroponic were studied. There were 3 treatments: white LED as control (CK), white-red LED (R: W=1:4) (T1), red-white LED (R:W=1:1) (T2) (red LED light 660 ± 20 nm). The PAR (Photosynthetically Active Radiation) was 150 μ mol.m-2.s-1, irradiation duration: 6:30-18:30. The lettuces were grown 35 days under different light treatment. The results showed that the growth and quality of lettuce were significantly affected by light quality treatment. The growth of shoot and root in hydroponic lettuce were enhanced by red light, and increased with the ratio of red light increased. The fresh weight of shoot increased by 34.6% and 52.7%, and that of root by 46.9% and 97.8% in T1 and T2 treatment respectively. And the dry weight of shoot increased by 40.3% and 66.7%, and that of root by 62.5% and 91.7% in T1 and T2 treatment respectively. The contents of soluble sugar and Vitamin C increased under red light, and increased with the ratio of red light increased. The soluble sugar concentrations in lettuce increased by 19.8% and 94.7%, and Vitamin C concentration by 76.7% and 97.4% in T1 and T2 treatment respectively. The nitrate concentrations decreased under red light, and decreased with the ratio of red light increased. The nitrate concentrations in lettuce decreased by 37.8% and 40.1% in T1 and T2 treatment respectively. Thus more red light is benefit for the growth and quality of lettuce in hydroponic.
{"title":"Effects of light quality on growth and quality of lettuces in hydroponic","authors":"Roy C. Y. Chen, Houcheng Liu, Shiwei Song, Guangwen Sun, R. Chen","doi":"10.1109/SSLCHINA.2015.7360712","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360712","url":null,"abstract":"The effects of light quality on growth and quality of lettuce in hydroponic were studied. There were 3 treatments: white LED as control (CK), white-red LED (R: W=1:4) (T1), red-white LED (R:W=1:1) (T2) (red LED light 660 ± 20 nm). The PAR (Photosynthetically Active Radiation) was 150 μ mol.m-2.s-1, irradiation duration: 6:30-18:30. The lettuces were grown 35 days under different light treatment. The results showed that the growth and quality of lettuce were significantly affected by light quality treatment. The growth of shoot and root in hydroponic lettuce were enhanced by red light, and increased with the ratio of red light increased. The fresh weight of shoot increased by 34.6% and 52.7%, and that of root by 46.9% and 97.8% in T1 and T2 treatment respectively. And the dry weight of shoot increased by 40.3% and 66.7%, and that of root by 62.5% and 91.7% in T1 and T2 treatment respectively. The contents of soluble sugar and Vitamin C increased under red light, and increased with the ratio of red light increased. The soluble sugar concentrations in lettuce increased by 19.8% and 94.7%, and Vitamin C concentration by 76.7% and 97.4% in T1 and T2 treatment respectively. The nitrate concentrations decreased under red light, and decreased with the ratio of red light increased. The nitrate concentrations in lettuce decreased by 37.8% and 40.1% in T1 and T2 treatment respectively. Thus more red light is benefit for the growth and quality of lettuce in hydroponic.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123155791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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