成果報告書詳細
管理番号20130000000876
タイトル*平成24年度中間年報 次世代高効率・高品質照明の基盤技術開発 戦略的国際標準化推進事業 LED光源、並びにLED照明器具の性能評価方法の国際標準化に係る研究開発(1)
公開日2013/10/18
報告書年度2012 - 2012
委託先名パナソニック株式会社
プロジェクト番号P09024
部署名電子・材料・ナノテクノロジー部
和文要約
英文要約Title: Fundamental Technology Development of Next-generation High-efficiency and High-quality Lighting. Development of Standardization and International Harmonization. Research regarding international standardizations for performance evaluation methods of LED light sources and luminaires (FY2010-FY2013) FY2012 Annual Report

Light Emitting Diodes (LEDs) are expected to be widely used as lighting sources in the near future. However, since LEDs characteristics are much different from conventional sources, some existing standards for photometric testing cannot be applied them. The lack of testing standards has made it difficult for customers to compare LED products performances. This research is addressing this issue by developing photometric methods for LED lighting product testing and installation evaluation. The outcomes in FY 2012 are summarized below:
1. Development of the absolute goniophotometry for LED products
Absolute goniophotometry is an option to measure total luminous flux of LED luminaires that cannot be separated to lamps and other parts. JIS C 8105-5 describes the methods for general luminaires including LED products. However, there are some remaining issues to realize the methods. The implementations of JIS C 8105-5 into two types of goniophotometer are under development.
1.1 Multiple-photodetector type goniophotometer
A camera system has been installed in order to check alignment of luminaire under test. A four electrode method, which makes electric measurements more accurate, also has been implemented. Additionally, uncertainty budget was investigated for the goniophotometer. The budget became unique because the goniophotometer has 181 photodetectors, while normal goniophotometers have only one photodetector.
1.2 Mirror type goniophotometer
Many photometric test results for general lighting LED products, which were measured with a mirror type goniophotometer and JIS C 8105-5, were verified. Some significant uncertainty sources were found by investigation of an uncertainty budget for the system. System changes and corrections were made for uncertainty reduction.
2. Development of a visual task performance measurement method for LED lighting installations
CIE 191 recommends a photometry system, which defines spectral luminous efficiency in mesopic range. It is expected to change energy efficiency evaluation of LED outdoor lighting. However, there is no instrument to measure ‘mesopic luminance’ based on CIE 191.
Both an imaging luminance meter (ILM) and a spot luminance meter (SLM) are under development since last FY. For the ILM, spectral sensitivity correction filters have been installed into a base ILM. It has been verified that the corrected spectral sensitivities was sufficiently close to the luminous efficiency functions. For the SLM, theoretical spectral errors have been simulated and the results show that the SLM can measure LED lighting within 0.5 % error.
Another issue is a definition of adaptation field, which determines the mesopic luminous efficiency function. Experiments with white stimuli have been conducted in order to measure surrounding luminance effect to peripheral adaptation state. The adaptation state depends on local luminance mainly, as same as results with blue and red stimuli in last FY.
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