Experiment on Luminous Characteristics and Illuminance Distribution of LED Lighting with Hanji Diffuser

Abstract

This research covers the features of an light emitting diode (LED) light source paired with different diffuser types. The research was conducted in two phases. The first phase included different colored LEDs with three diffusers and illuminance, luminance, radiance and the spectrum of the light were measured. The LED colors used in the experiment were red, green, blue and two shades of white. The diffusers used were made of clear glass, acrylic and the Korean traditional paper, hanji. The LEDs were measured without a diffuser for comparison. The measurements were conducted in a closed space, with no outside light entering the room. One measurement point was used to measure the features of the light. The second phase was conducted in an office environment. The light source was made of three white LED downlight luminaires. The measurements covered the distribution and the uniformity of the produced light. The luminaires were paired with a diffuser made of acrylic and a diffuser made of the Korean traditional paper, hanji. As a comparable, the light was measured without any diffusers. In order to measure the distribution and uniformity, a grid of 50x50mm was prepared. This grid produced 60 points of measurement in total. The research concluded that the diffuser made of hanji paper will alter the lighting characteristics by muting the strength of the produced light qualities. This effect has it's advantages and disadvantages, since hanji will require a more efficient lighting in order to achieve illuminance standards required for spaces with different purposes. The advantage is the effective diffusion the hanji paper produces. Since this research covered only the objective research on one type of hanji paper, further studies on different types of hanji and subjective experiments are to be considered.