Design of Better Uniform Vertical Illuminance Distribution of Luminaires and Their Applications

• Main Authors: Chia-wei Wu, 吳佳薇
• Other Authors: Horng-Ching Hsiao
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/pz7p5a

碩士 === 國立臺灣科技大學 === 電機工程系 === 100 === Conventionally, the uneven luminance distribution and great discomfort glare were found in vertical illuminance applications due to inadequate selection of luminaires and placement, especially in stadium, museums, blackboard in the classroom etc. It caused players misjudging the ball down position, visual feeling in exhibitions and visual fatigue. The purpose of the thesis is to develop a design procedure and methodology for luminaires, by light emitted diodes LED, which are vertical illuminance distribution oriented in order to raise the light quality. A luminaire for blackboard in the classroom is selected as example for discussion, the LED light tube and asymmetric reflector are used to simulate luminous distribution by commercial software TracePro. Then, we applied the lighting simulation software DIALux to set up the lighting environment of classroom and simulate the lighting parameters, including the average illuminance, the unified glare ratio UGR, illuminance uniformity, contrast uniformity and lighting power density etc., for traditional fluorescent lamps luminaire and better designed LED luminaries respectively. A systematic lighting quality evaluation technique was used to evaluate the lighting quality from the two different luminaries based on the results above. The redesigned LED luminaire has better performances than the traditional fluorescent lamps luminaire does, such as higher average illuminance, better even luminous distribution and less lighting power density. The total performance score of the redesigned LED luminaire is 86.5, higher than 73.9 of T8 and 76.9 of T5, traditional fluorescent lamps luminaires, to prove the feasibility and effectiveness of LED sources used in the vertical illuminance applications.