Founded by Pei-heng Tsai in 2004 and incorporated in 2006, PHT Lighting Design Inc. brings over ten years of design and project management experience on large-scale works in the US and overseas. Over the years, Tsai has collaborated with many internationally known architectural firms. In conjunction with her design practice, she is also involved in the academic community.

Her extensive prior experience ranges from institutional and educational facility design to projects with commercial buildings, displays and exhibition spaces, as well as large-scale urban outdoor projects. Her design emphasis is on creative and architecturally integrated lighting solutions. Currently under construction are several school and university developments, wherein public space designs accommodate both function and form, facilitating daily operations and creating aesthetically engaging visual signatures.

The company is registered in the state of New York, and certified as Minority/Women-Owned Business Enterprise by the City of New York.