PHT Lighting Design is an award winning NYC based architectural lighting design practice. Our firm provides a full scope of professional services from initial concept through the construction phase to architectural design professionals as well as individual owners, contractors and developers. Our projects span across various sectors including commercial work spaces, retail, restaurants, institutions, private residences, hotels and outdoor public spaces.

PHT Lighting Design holds to a core belief that thoughtfully designed lighting will create significant positive impact on our daily lives. Aside from giving form to the spaces, well executed lighting also provides emotional and physical comfort, increased employee productivity, energy conservation and enlivens our shared urban environment. Our design philosophy seeks to craft customized, inventive and elegant lighting solutions that support our clients’ business identities, enhance their property value and improves the end user’s experience and well-being.

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The team at PHT Lighting Design has a solid design background in architecture. Simply stated we treat lighting as a medium by which we bring spaces to life. We begin each project with artistic inspiration and pragmatic analysis. We optimize the design solutions through accurate photometric studies and physical mock ups.  Our active engagement with the manufacturing community allows us to remain technically sound as new and ever-evolving LED technology comes to market. Through careful studies and collaborative interaction with other disciplines on the design team, we are able to realize creative and cost effective designs that elevate the value of project.

As a M/WBE certified firm, PHT Lighting Design has a well-established presence citywide and is actively engaged in regional and international projects. Over the years a diverse group of institutions and individual owners having a deeper understanding of the vital role lighting plays have benefited from our services. Our past clients have included large prestigious New York City institutions such as NYU and The New School as well as many small and medium sized businesses that are the heart and soul of the New York experience.  



Lighting has become an ever-important element in modern living, as people spend prolonged hours in the indoor environment and rely on artificial illumination to extend our activities into the night. A sensitive and studied approach is needed to provide illumination that can enhance the spaces and reveal the true spirit of the physical environment while meeting the physiological and psychological needs of clients and end users.

Founded by Peiheng Tsai in 2006, the team at PHT Lighting Design is dedicated to create a seamless integration of the lighting into the architecture. We welcome opportunities to resolve complex design challenges by developing inventive solutions. Our team strives to maintain a dynamic practice, keeping abreast of new technological advances. We help create healthy emotional and physical environments within a sustainable energy footprint. What sets PHT Lighting Design apart is a distinct blending of artistry, creativity and practical resourcefulness coming together to elevate each project collectively.


A transplant from Taipei, Peiheng Tsai resettled in New York City to pursue her graduate studies at Columbia University earning a Master of Architectural Design degree. Drawing on her background Peiheng focuses on bringing her unique insight and cross cultural understanding into creating a significant design value for her clients.

With her architectural training as a solid foundation, Peiheng brings a granular understanding to the design process enabling a seamless workflow within the entire design team. She believes good design is achieved through clear communication within a collaborative process.

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Prior to establishing PHT Lighting Design, Peiheng was employed as a project manager and designer at the internationally acclaimed firm L’Observtoire International, leading several large scale projects including Columbus Circle, the Standard Hotel Highline and the Newtown Creek Waste Water Treatment Plant Lighting Masterplan located in Greenpoint, Brooklyn. Aside from her professional practice, she is actively engaged within the education community serving as an adjunct professor at the New York School of Interior Design.




The PHT team works closely with architects, designers, and individual owners creating customized solutions that suit each project’s specific criteria. We believe the best solutions come from an open dialogue. We encourage our clients to engage our consultancy early in the design process to maximize the benefit from our integrated approach to lighting and the architecture.


  • Interior and exterior architectural lighting design
  • Photometric calculationss
  • Visualizations of lighting effect and renderings
  • Physical lighting mock-ups
  • Lighting fixture specifications and technical documents
  • Lighting layouts in AutoCAD and Revit
  • Code Research of applicable design criteria
  • Custom fixture design: Collaborate with design professionals and clients to design and manage the fabrication of lighting fixture
  • LED integration: Work as a consultant to assist the selection of LED products for optimum energy efficiency and illumination quality
  • Collaboration with an extensive network of lighting manufacturers, distributors and procurement agencies for a coordinated team approach
  • LEED certification and energy code compliance
  • On-Site services: lighting fixtures focusing, lighting control system start up and fine tuning at the end of the construction