Characteristic research on a spectrum adjustable LED
Underwater lighting has been the subject of many researchers. Although commonly used halogen lamps and incandescent bulbs have high CRI in the air, they are affected by absorption and scattering in water, resulting in lower CRI. In case of photography, an auxiliary light source is even needed. LED has a characteristic of concentrated emitting wavelength, so LED can not reach the traditional lamp's high CRI; however, in the water or even in fog or smoke environment, the adjustable light color in LED can control the color mixing to improve the CRI. The long term goal of this research is to develope a device which can be applied in a high scattering environment by using a new multi-chip LED light source. Adjusting the electrical current to change the color mixing can improve CRI in different scattering environment. Preliminary experiments were performed by using the multi-chip LED light source to measure its optical properties in the water, and verify that this LED can improve the problem that LED has a lower CRI in the water. The LED's underwater illumination was also simulated by optical simulation software TracePro, and compared with the experimental results in order to build the design model which can be used in underwater LED devices. Keyword: LED, Underwater, Color mixing, CRI, Scattering
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