研究目的
The aim of this study is to assess the fraction of radiation in the blue region of the entire spectrum of white LED lights and propose low-cost filters to reduce the blue-rich components of LED lighting.
研究成果
Our assessments reiterate the presence of sharp blue peak i.e. high energy emission in the blue region of the visible spectrum for the tested commercially available white LED lights. Our solutions (including Polyamide Tape) are crucial in addressing the blue-peak issue of white-LED lights, most of which are already produced and are readily available in the market. These low-cost blue-light cutting filters would empower the masses to procure safe domestic lighting in view of the LED lighting revolution in the rural context.
研究不足
The thickness of the paint was not controlled in the current study. A more detailed study involving different thickness of paint and its effect on filtering needs to be done in the future.
1：Experimental Design and Method Selection:
A comparative assessment of the spectra of natural lighting versus artificial indoor lighting was undertaken using a portable miniature spectrometer preconfigured for the UV-VIS measurements with a wavelength range of 200-1100 nm.
2：Sample Selection and Data Sources:
A set of five commercially available LED luminaires with different CCT were chosen for the test.
3：List of Experimental Equipment and Materials:
Ocean Optics USB 4000 Series Spectrometer, fibre optic cable, different filters (Polyamide Tape, Cellophane Polymer Sheet, Glass Paint Sunflower, Glass Paint Golden Yellow, Glass Paint Sunset Orange).
4：Experimental Procedures and Operational Workflow:
The spectrums of all the LEDs with and without filters were recorded. The filters were placed on the luminaire during the measurement. The fibre optic end was directed along the line of the tip of the light source.
5：Data Analysis Methods:
The fraction of radiation in the blue region (400-480nm) was quantified.
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