A Freeform Mirror Design of Uniform Illumination in Streetlight From a Split Light Source
A streetlight with a split light source is presented to construct a freeform mirror for converting a certain light distribution into uniform illumination. It is easy to maintain the proposed streetlight because the light sources are placed at the bottom of the lamppost. Two collimated mirrors are em...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2018-01-01
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| Series: | IEEE Photonics Journal |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/8421583/ |
| _version_ | 1818457978888519680 |
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| author | Cheng-Mu Tsai Bo-Xiang Wang |
| author_facet | Cheng-Mu Tsai Bo-Xiang Wang |
| author_sort | Cheng-Mu Tsai |
| collection | DOAJ |
| description | A streetlight with a split light source is presented to construct a freeform mirror for converting a certain light distribution into uniform illumination. It is easy to maintain the proposed streetlight because the light sources are placed at the bottom of the lamppost. Two collimated mirrors are employed to allow the rays to travel a long distance without much loss of power. There are 400 × 400 pieces of area divided at a reference plane (RP), a freeform mirror (FM) and an illumination area (IA). According to light distribution, a method is proposed to evaluate the equal luminance at each RP-divided area. Such equal luminance is expected to develop the FM to reflect rays into the IA with uniform illumination. The simulation results show that average illumination is 20.6 lx in the required area with 90% power efficiency, 85.9% uniformity, and lower glare. |
| first_indexed | 2024-12-14T22:51:09Z |
| format | Article |
| id | doaj.art-743791ce3fe2469199c5ee190da39807 |
| institution | Directory Open Access Journal |
| issn | 1943-0655 |
| language | English |
| last_indexed | 2024-12-14T22:51:09Z |
| publishDate | 2018-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj.art-743791ce3fe2469199c5ee190da398072022-12-21T22:44:43ZengIEEEIEEE Photonics Journal1943-06552018-01-0110411210.1109/JPHOT.2018.28607968421583A Freeform Mirror Design of Uniform Illumination in Streetlight From a Split Light SourceCheng-Mu Tsai0https://orcid.org/0000-0002-8919-5427Bo-Xiang Wang1Graduate Institute of Precision Engineering, National Chung Hsing University, Taichung city, Taiwan, R.O.C.Graduate Institute of Precision Engineering, National Chung Hsing University, Taichung city, Taiwan, R.O.C.A streetlight with a split light source is presented to construct a freeform mirror for converting a certain light distribution into uniform illumination. It is easy to maintain the proposed streetlight because the light sources are placed at the bottom of the lamppost. Two collimated mirrors are employed to allow the rays to travel a long distance without much loss of power. There are 400 × 400 pieces of area divided at a reference plane (RP), a freeform mirror (FM) and an illumination area (IA). According to light distribution, a method is proposed to evaluate the equal luminance at each RP-divided area. Such equal luminance is expected to develop the FM to reflect rays into the IA with uniform illumination. The simulation results show that average illumination is 20.6 lx in the required area with 90% power efficiency, 85.9% uniformity, and lower glare.https://ieeexplore.ieee.org/document/8421583/Light-emitting diodesIllumination designNonimaging optics. |
| spellingShingle | Cheng-Mu Tsai Bo-Xiang Wang A Freeform Mirror Design of Uniform Illumination in Streetlight From a Split Light Source IEEE Photonics Journal Light-emitting diodes Illumination design Nonimaging optics. |
| title | A Freeform Mirror Design of Uniform Illumination in Streetlight From a Split Light Source |
| title_full | A Freeform Mirror Design of Uniform Illumination in Streetlight From a Split Light Source |
| title_fullStr | A Freeform Mirror Design of Uniform Illumination in Streetlight From a Split Light Source |
| title_full_unstemmed | A Freeform Mirror Design of Uniform Illumination in Streetlight From a Split Light Source |
| title_short | A Freeform Mirror Design of Uniform Illumination in Streetlight From a Split Light Source |
| title_sort | freeform mirror design of uniform illumination in streetlight from a split light source |
| topic | Light-emitting diodes Illumination design Nonimaging optics. |
| url | https://ieeexplore.ieee.org/document/8421583/ |
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