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LED lighting has been used for illumination in a long history. Using spectrum control through LED colour mixing and colour control, the spectrum of the light can be adjusted and hence the performance of the illumination can be controlled. Using this method, the illumination spectrum can be adjusted during the day and night. It is also shown that this will have benefit to breast cancer and depression...
This study aimed to investigate the family, school, peer and psychological factors that contribute to adolescent suicidal ideation. The participants were 1,358 (680 boys and 678 girls) Hong Kong Chinese adolescents who were divided into younger (12.3 years, n=694) and older (15.4 years, n=664) age groups. By using structural equation modeling, the results showed that family cohesion and sense of school...
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