ONLINE SHARING

Selection methods and procedure for evaluation of LED roadway luminaries. Appendix A_Roadway LED Luminaire_IPL.xlsxAppendix B_Roadway LED Luminaire_APL.xlsxAppendix C_Roadway LED Luminaire Short List.xlsxAppendix D_Lighting_Economics_Calculator.xlsx.

MatLab code for data treatment of per-pixel luminance and luminance gradient extracted from HDR images, as well as plotting the 2D luminance map and 2D /3D luminance gradient maps. MatLab code.

Luminance gradient for lighting evaluation. Figure 3Figure 4More examples

A review of 96 legibility equations. Appendix A list of symbolsAppendix B equations.

Camera-aided illuminance calculation MATLAB code:

Tokyo University of Science illuminance calculation code University of Kansas illuminance calculation code

 

JOURNAL PUBLICATIONS, PEER REVIEWED

(Corresponding (lead) author underlined)

Poling R. M., & Cai, H. (2021). Calculating luminous flux radiated to a camera lens via high dynamic range photogrammetry. Lighting Research & Technology, 53(2), 119-145.

Nelson, M. A., Anderson, B. P., & Cai, H. (2017). Selection methods and procedure for evaluation of LED roadway luminaries. LEUKOS: The Journal of the Illuminating Engineering Society of North America, 13(3), 159-175. (Appendix A_Roadway LED Luminaire_IPL.xlsx, Appendix B_Roadway LED Luminaire_APL.xlsx, Appendix C_Roadway LED Luminaire Short List.xlsx, Appendix D_Lighting_Economics_Calculator.xlsx)

Saifan, M. I., & Cai, H. (2017). Can high dynamic range images help lighting design analysis: Results of a survey. Light and Engineering. (Accepted-In press, publication #1-2017)

Cai, H., & Li, L.(2016). How LED lighting may affect office ergonomics: the impact of providing access to continuous dimming controls on typing and colour-matching tasks performance. Light and Engineering, 24(2): 25-36.

Cai, H. (2016). Luminance gradient for evaluating lighting. Lighting Research & Technology, 48(2): 155-175. (MatLab code., Figure 3. Figure 4. More examples)

Cai, H., Saifan, M.I., & Killeen, J.A. (2015). Case studies of a camera-aided imaging method for evaluation of interior luminous environments. Indoor and Built Environment, 24(5): 658-671.

Cai, H., & Li, L. (2014). The impact of display angles on the legibility of Sans-Serif 5 x 5 capitalized letters. Applied Ergonomics 45 (4): 865-877.

Cai, H., & Li, L .(2014). Measuring light and geometry data of roadway environments with a camera. Journal of Transportation Technologies, 4(1): 44-62.

Cai, H, Green, P. A. & Kim, J. J. (2013). Estimating the Legibility of a Single Letter E Viewed at Different Display Angles. Applied Ergonomics 44(4): 575-587.

Cai, H.. (2013). High dynamic range photogrammetry for synchronous luminance and geometry measurement. Lighting Research & Technology, 45(2): 230-257.

Cai, H. & Chung T. M.. (2013). Evaluating discomfort glare from non-uniform electric light sources. Lighting Research & Technology, 45(3): 267-294.

Cai, H., Kim, J. J., & Green, P. A. (2011). Computational assessment of text legibility in lecture halls. Indoor and Built Environment. 20(3): 321- 332.

Cai, H. & Chung T. M. (2011). Improving the quality of high dynamic range images. Lighting Research & Technology, 43 (1): 87-102.

Cai, H. & Green, P. A. (2009). Legibility Index to Examine Common Viewing Situations: A New Definition Using Solid Angle. LEUKOS: The Journal of the Illuminating Engineering Society of North America, 5 (4): 279-295.

Li, J. & Cai, H. (2001). Apply the visual modeling theory to the Chongqing xiexin garden club outdoor lighting project. China Illuminating Engineering Journal, 12(1), 38-41.

Li, J., Mo, Y. H., & Cai, H. (2001). Outdoor lighting design for Guangdong Olympic gymnasium —application of high-tech and impressionism. Engineering Design CAD and Intelligent Building, 5, 27-28.

Cai, H. (2000). A new lighting planning method for small shop interiors — merchandise siting method. China Illuminating Engineering Journal, 11(1), 41-48, 11(2), 32-38.

Cai, H. (1999). Lighting design of middle and small shops. China Illuminating Engineering Journal, 10(3), 64-69.

Cai, H. & Yang, G.X. (1999). Reforming the greenish art square. Chongqing Architecture, 22(3+4), 41-44.

Cai, H. (1999). Research on ecological ranking theory of relationship of people in the city. HuaZhong Architecture, 2, 88-92.

 


CONFERENCE PAPERS, PEER REVIEWED

2020

Li, H., Cai, H., & Wang, G. (2020). Improving High Dynamic Range Image Based Light Measurement. 2020 IEEE International Conference on Systems, Man, and Cybernetics. Toronto, Canada, Oct. 11-14, 2020.

He, S., Cai, H., & Yan, Y.(2020). Camera-aided measurement of luminous flux captured by the binocular field of view. 2020 IES Annual Conference. Virtual. Aug.24-Sept 2, 2020.

Li, H., & Cai, H. (2020). Fast high dynamic range imaging for lighting measurement. 2020 IES Annual Conference. Virtual. Aug.24-Sept 2, 2020.

Cai, H., Schrock, S. D., & Fitzsimmons, E. J. (2020). Self de-icing LED signals: Implementation Activities. Rail Safety IDEA and NCHRP IDEA poster sessions. Transportation Research Board 98th Annual Meeting, January 12-16, 2020, Washington D. C. (invited)

2019

Mahoney, E, & Cai, H. (2019). Using Luminance to Supplement Current Illuminance-Based Design Codes for Design of Efficient Luminous Environments. Illuminating Engineering Society Annual Conference 2019, August 8-10, 2019, Louisville, KY.

Li, H., & Cai, H. (2019). A Laboratory Method for Measuring the Heat Distribution of Luminaires and Its Application for Building Heating and Cooling Energy Savings. Illuminating Engineering Society Annual Conference 2019, August 8-10, 2019, Louisville, KY.

Mahlab, F., & Cai, H. (2019). Circadian Light Measurement in a Hospital Room with the Aid of High Dynamic Range Imaging Technology. Illuminating Engineering Society Annual Conference 2019, August 8-10, 2019, Louisville, KY.

Cai, H., Schrock, S. D., & Fitzsimmons, E. J. (2019). Self de-icing LED signals: From Concept to Implementation. Rail Safety IDEA and NCHRP IDEA poster sessions. Transportation Research Board 98th Annual Meeting, January 13-17, 2019, Washington D.C. (invited)

2018

Poling, R., Li, L., & Cai, H. (2018). Calculating Luminous Flux Using High Dynamic Range Imaging and Its Application in an Office Space. Illuminating Engineering Society Annual Conference 2018, August 9-11, 2018, Boston, MA.

Diederich, & Cai, H. (2018). Development and Commissioning of a Calorimeter for Testing the Thermal Performance of Luminaires. Illuminating Engineering Society Annual Conference 2018, August 9-11, 2018, Boston, MA.

Barri, A., Chang, J., Cai, H., & Barrett-Gonzalez, R. (2018) Computer Simulation of Dynamic Thermal-Adaptive Curved Lightshelf for Daylight Control in Buildings. Architectural Research Centers Consortium, Inc. (ARCC) 2018 ARCC-EAAE International Conference, May 16-19, 2018, Philadelphia, Pennsylvania.

Barri, A., Chang, J., Cai, H., & Barrett-Gonzalez, R. (2018) Physical Experimental Study of a Dynamic Thermal-Adaptive Curved Lightshelf for Daylight Control in Buildings. Building Enclosure Science and Technology BEST5 technical conference, April 16-18. 2018, Philadelphia, Pennsylvania.

Cai, H., Schrock, S. D., & Fitzsimmons, E. J. (2018). Self de-icing LED signals. Poster in the Rail Safety IDEA and NCHRP IDEA poster sessions. Transportation Research Board
97th Annual Meeting, January 7-11, 2018, Washington D. C.

2017

Roberts, T., and H. Cai (2017). “Hybrid Renewable Energy System Model Analysis: Pumped Hydrogen Storage Compared to Battery-Bank Storage Systems,” The 2017 Architectural Engineering Institute Professional Conference, April 11-13, 2017, Oklahoma City, OK.(Accepted for oral presentation)

Cai, H., Schrock, S. D., & Fitzsimmons, E. J.  (2017). Self de-icing LED signals. Poster in the Rail Safety IDEA and NCHRP IDEA poster sessions. Transportation Research Board 96th Annual Meeting, January 8-12, 2017, Washington D. C. (Invited)

Barri, A., Chang, J., Cai, H., & Barrett-Gonzalez, R. (2017). Computer Simulation on Dynamic Thermal-Adaptive Curved Lightshelf for Daylight Control in Buildings. Illuminating Engineering Society Annual Conference 2017, August 10-12, 2017, Portland, OR.

Mahlab, S.F., & Cai, H. (2017). Measuring Correlated Color Temperature and Duv of white LEDs Using Digital Camera: A Second Laboratory Study. Illuminating Engineering
Society Annual Conference 2017, August 10-12, 2017, Portland, OR.

2016

Kurian, H., and H. Cai (2016). “Camera-Aided Glare Analysis in Sports Arenas,” Illuminating Engineering Society Annual Conference 2016. October 23-25, 2016. Orlando, FL. (Accepted for oral presentation)

Mahlab, S.F., and H. Cai (2016). “Is It Possible to Measure the Correlated Color Temperature of LEDs Using a Camera,” Illuminating Engineering Society Annual Conference 2016. October 23-25, 2016. Orlando, FL. (Accepted for oral presentation)

Cai, H., S. D. Schrock, and E. J. Fitzsimmons (2016). “Self De-Icing LED Signals: The Concept and Laboratory Evaluation,” Transportation Research Board 95th Annual Meeting. Jan. 10-14, 2016. Washington D.C.

2015

Cai, H., M. A. Nelson, and B. P. Anderson (2015). “Implementation Cost Analysis of Qualified LED Luminaires for Kansas Roadways,” Illuminating Engineering Society Annual Conference 2015. Nov. 8-10, 2015. Indianapolis, IN.

Cai, H., and M. I. Saifan (2015). “A Questionnaire Survey on Using High Dynamic Range Photography for Lighting Design,” Illuminating Engineering Society Annual Conference 2015. Nov. 8-10, 2015. Indianapolis, IN.

Lee, J.H., J. D. Chang, and H. Cai (2015). “A study of Shading Devices Control on the Natural Ventilation Efficiency and Daylight Harvesting of a Double Skin Façade,” The 2015 Healthy Buildings America conference. July 19-22, 2015. Boulder, CO.

Cai, H. (2015). “Solar design foundation: using high dynamic range photogrammetry for luminance mapping the sky and the sun,” The 2015 Architectural Engineering Institute Professional Conference, March 24-27, 2015, Milwaukee, WI.

Jiang, Y., J. Han, R. L. Parsons, J. J. Brennan, and H. Cai (2015). “Field Instrumentation and Evaluation of MSE Walls with Secondary Geogrids,” Transportation Research Board 94th Annual Meeting, session 503, 15-3293. Jan. 11-15, 2015. Washington, D.C.

2014

Cai, H., M. I. Saifan, and J. A. Killeen (2014). “Case Studies of a Camera-Aided Imaging Method for Evaluation of Interior Luminous Environments,” Illuminating Engineering Society Annual Conference 2014. Nov. 2-4, 2014. Pittsburgh, PA

Cai, H. (2014). “Luminance Gradient,” Illuminating Engineering Society Annual Conference 2014. Nov. 2-4, 2014. Pittsburgh, PA.

2013

Cai, H. (2013). “High Dynamic Range Photogrammetry for Light and Geometry Measurement,” 2013 Architectural Engineering Institute Conference. April 3-5, 2013. Penn State University, University College, PA.

2012

Su, X., M. Mahoney, M. Saifan, and H. Cai (2012). “Mapping Luminance Gradient across a Private Office for Daylighting,” Illuminating Engineering Society Annual Conference 2012. Nov. 11-13, 2012. Minneapolis, MN.

Cai, H., and L. Li (2012). “Text Legibility at Different Viewing Angles: A Pilot Study,” Illuminating Engineering Society Annual Conference 2012. Nov. 11-13, 2012. Minneapolis, MN.

Li, L., and H. Cai (2012). “Roadway Environment Measurement Aided by the High Dynamic Range Photogrammetry,” Illuminating Engineering Society Annual Conference 2012. Nov. 11-13, 2012. Minneapolis, MN.

2011

Cai, H. (2011). “A Practical Legibility Index: from Definition to Measurement Technology,” The 55th Annual Meeting of the Human Factors and Ergonomics Society. September 19-23, 2011. Las Vegas, Nevada, USA. In Proceedings of the Human Factors and Ergonomics Society Annual Meeting 2011 55: 1215. DOI: 10.1177/1071181311551253.

Cai, H. (2011). “A Camera-aided Legibility Assessment Protocol of Displays for Enhanced Human-computer Interaction,” The 14th International Conference on Human-Computer Interaction 2011. July 9-14, 2011, Orlando, Florida, USA. In A. Marcus (ed.), HCI (10) (p./pp. 359-367), : Springer. ISBN: 978-3-642-21707-4.

Cai, H. (2011). “High Dynamic Range Photogrammetric Techniques: A New Tool for Lighting Quality Assessment,” International Commission on Illumination CIE-Session 2011, July 10 – 15, 2011, Sun City, South Africa. In Proceedings of the CIE Quadrennial Meeting 2011, Sun City, South Africa. Vienna: CIE, 2011.

Cai, H., Z. D. Steinkuhler, and J. P. Shore (2011). “Camera-aided Illuminance Measurement: A Pilot Study,” Illuminating Engineering Society Annual Conference 2011: Lessons in sketching: from master classes to global lighting solutions. Oct. 30-Nov.1, 2011. Austin, TX.

Cai, H. (2011). “Camera Aided Luminance Measurement of the Luminous Surfaces of Different Light Sources,” 2011 Architectural Engineering Conference. March 30 -April 2, 2011. Oakland, CA.

Cai, H. (2011). “Using High Dynamic Range Photogrammetric Techniques for Optimizing Lighting Energy Saving in Buildings,” International Conference on Sustainable Design and Construction. March 23–25, 2011. Kansas City, MO.

2010

Chung, T. M., and H. Cai (2010). “High Dynamic Range Images Generated under Mixed Types of Lighting,” Illuminating Engineering Society Annual Conference 2010. November 7-9, 2010. Toronto, Canada.

Cai, H., and T. M. Chung (2010). “Introduction to High Dynamic Range Photogrammetric Techniques: Beginning of a New Lighting Stage,” Illuminating Engineering Society Annual Conference 2010. November 7-9, 2010. Toronto, Canada.

2009

Cai, H., and T. M. Chung (2009). “Quality of High Dynamic Range Images for Luminance Data Acquisition versus Aperture Size of Camera And Exposure Ranges,” Illuminating Engineering Society Annual Conference 2009: Realizing the Future-Research to Application. November 15-17, 2009. Seattle, WA.

Chung, T. M., and H. Cai (2009). “Comparative Study of UGR Calculations for Parabolic Fluorescent Luminaires Aided by High Dynamic Range Imaging Techniques,” Illuminating Engineering Society Annual Conference 2009: Realizing the Future-Research to Application. November 15-17, 2009. Seattle.

2007

Cai, H., and P. A. Green (2007). “New Definition of Legibility Index to Examine Off-Axis Viewing of Text and Graphics,” IES Annual Conference: Light Matters 2007: Integrating Light Into Our Environments. General Lighting Topics. January 28-30, 2007. Phoenix, AZ.

Cai, H. (2007). “A Laboratory Method to Simulate Spatial Legibility of Displays,” Asia Display 2007. AD8. March 12-16, 2007. Shanghai, China.

2005

Cai, H., and P. A. Green (2005). “Character Heights for Vehicle Displays as Predicted by 22 Equations,” Digest of Technical Papers. 2005 SID Vehicle Display Symposium. Human factors. Paper # 2.2., October 6-7, 2005, Dearborn, MI.

 


PRESENTATIONS, INVITED

2019

Cai, H. (2019). Self-Deicing LED Signals. Research Report to the Rail Safety IDEA and NCHRP IDEA programs of Transportation Research Board. Washington D. C., 12/05/2019.

Cai, H. (2019). Camera-Assisted Lighting Design. Seminar to undergraduate and graduate students in the Department of Architecture, Faculty of Science and Technology, Tokyo University of Science, 10/06/2019.

Cai, H. (2019). Self-Deicing LED Signal Heads. 2019 Annual Central Section IMSA / KAUTC Meeting, Lawrence KS, 03/06/2019.

2017

Cai, H. (2017). Camera-aided and Integrative Lighting Research for a Transforming Lighting Profession. Department of Civil, Environmental and Architectural Engineering, University of Colorado - Boulder, Boulder, CO, 02/15/2017.

2016

Cai, H. (2016).  New LED technologies for building energy savings. An invited talk before audience from the local business community and from the University of Kansas in the event of “Technology Tuesday” held by the University of Kansas Innovation & Collaboration (KUIC), Lawrence, KS, 09/27/ 2016. (Invited)

Cai, H. (2016).  Introduction to the Kansas highway LED illumination manual: A guide for the use of LED lighting systems. Training courses offered to KDOT district engineers in Topeka, Hays, and Hutchinson, KS, Jan 2016.

2015

Cai, H. (2015). A workshop in using integrating sphere to measure LEDs offered to students in Architectural Engineering, Architecture, and Theatre Design in three departments as part of the Illuminating Engineering Society (IES) grant, fall, 2015, Lawrence, KS, 09/16/2015.

Cai, H. (2015).  Lighting research toward ‘better’ luminous environments. Department of Civil and Architectural Engineering and Construction Management, University of Cincinnati, 04/29/2015.

2013

Cai, H. (2013).  Impact of new lighting technologies on office ergonomics. Presentation to the Office Ergonomics Research Committee in the venue of 2013 International Annual meeting of the Human Factors and Ergonomics Society, San Diego, CA, 09/29/2013.

2012

Cai, H. (2012). Oral presentation in the University in the Art Museum (UAM) workshop for faculty. University of Kansas Spencer Museum of Art, 04/20/2012.

Cai, H. (2012). Use of a camera to synchronously measure light and geometry of a scene.  KU Civil, Environmental & Architectural Engineering Professional Development Series, Burns & McDonnell, Kansas City, MO, 03/12/2012.

2010

Cai, H. (2010). Daylighting control and modeling technologies. Building Energy and Environmental Technology Research Unit, School of Energy and Environment, City University of Hong Kong, Hong Kong, 06/2010.

2009

Cai, H. (2009). Oral seminars on “sustainable lighting and LEED requirements” and “lighting effect on spatial legibility in architecture”, Durham School of Architectural Engineering & Construction, University of Nebraska, 01/20009.

2008

Cai, H. (2008). A seminar on ENERGY STAR and LEED programs. WAC lighting, New York, NY, 05/2008.