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We Connect People and Space Through Light



PHT Lighting Design is a woman-owned lighting design consultancy based in New York City.  We collaborate with architects, landscape architects, interior designers, and property owners to design customized illumination for built environments.  Our work spans many typologies and scales including public institutions, outdoor spaces, and private homes.

Our award-winning design team holds a core belief that thoughtfully designed lighting will create significant positive impacts on our daily lives.  We strive to craft inventive and elegant lighting solutions that support our clients’ business identities, enhance their property value, and improves the occupants' experience and well-being.



ABOUT Peiheng

In 2006, Peiheng Tsai founded PHT Lighting Design.  Originally from Taipei, Peiheng initially moved to New York to pursue her graduate studies at Columbia University earning a Master of Architecture at GSAPP.

With her architectural training and cross-cultural understanding, Peiheng brings a granular insight to the design process enabling a seamless workflow within a multi-disciplinary design team. 



Lighting is the invisible force that guides our perceptions of spaces.  As people spend prolonged hours indoors and rely on artificial lighting to extend the activities into the night, a sensitive and studied approach is needed to in revealing the true spirit of the physical environment while meeting the physiological and psychological needs of clients and end-users.

Our design process involves research, experimentation and curiosity.  We employ physical models, fixture samples, full-scale mock-ups, hand sketching, as well as digital simulation and renderings to visualize the lighting studies. 

listen . explore . iNVENT


Physical Mock Up


Material Test


Digital Simulation

We encourage our clients to engage our consultancy early in the design process to maximize the benefit from our integrated approach to lighting and architecture. Our team strives to maintain a dynamic practice, keeping abreast of new technological advances and resolve complex design challenges by developing inventive solutions.


what we do

PHT Lighting offers a full scope of services from Concept Design through Construction Administration and Site Focusing:

  • Interior and exterior architectural lighting design.

  • Photometric Analysis.

  • Visualizations of lighting effect and renderings.

  • Physical lighting mock-ups.

  • Luminaire specifications and technical documents.

  • Lighting layouts in AutoCAD and Revit.

  • Code Research of applicable design criteria.

  • Energy-efficient design, energy code compliance documentation including ComCheck reports.

  • Lighting control narratives and coordination with systems integrators.

  • Custom fixture design: Collaborate with design professionals and clients to design and manage the fabrication of lighting fixtures.

  • 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 aiming and adjustment of final lighting installations, lighting control system fine-tuning at the end of the construction.



Let's Work Together


If you are contacting PHT Lighting Design about a potential project, please include your building address, approximate square footage, and whether you are planning for full construction or partial renovation when you contact us.

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