Studio T+L

Studio T+L Studio T+L provides Theatre Planning + Design, and Lighting Design to architects and owners.

A Brief History of TM-30Next Wednesday I’ll be giving a presentation on LP-30 at LEDucation (hope to see you there!), an...
04/09/2026

A Brief History of TM-30

Next Wednesday I’ll be giving a presentation on LP-30 at LEDucation (hope to see you there!), and in preparing for it I’ve been reflecting on how far we’ve come in our understanding and evaluation of color rendering. The Color Rendering Index (CRI) was published by the International Commission on Illumination (Commission Internationale de l’Eclairage or CIE) in 1965, primarily to deal with the problem of poor color rendering by early fluorescent lamps. ...

Next Wednesday I’ll be giving a presentation on LP-30 at LEDucation (hope to see you there!), and in preparing for it I’ve been reflecting on how far we’ve come in our understanding and evaluation …

TM-30 Users Guide Now AvailableI'm delighted to announce that ANSI/IES LP-30 Lighting Practice: A Comprehensive Guide to...
02/19/2026

TM-30 Users Guide Now Available

I'm delighted to announce that ANSI/IES LP-30 Lighting Practice: A Comprehensive Guide to Specifying Color Rendition — Concepts, Criteria, and Implementation is now available in the IES Online Lighting Library and the IES Store. For more than three years, a half dozen IES Color Committee members worked to create a clear, concise, easy to understand document. LP-30 provides the industry with a guide to specifying color rendition with TM-30 by expanding on the framework of TM-30 Annex E....

I’m delighted to announce that ANSI/IES LP-30 Lighting Practice: A Comprehensive Guide to Specifying Color Rendition — Concepts, Criteria, and Implementation is now available in the IES Onlin…

Equity In Light at PS166QI have the great pleasure in joining other leading NYC lighting professionals in working with E...
02/02/2026

Equity In Light at PS166Q

I have the great pleasure in joining other leading NYC lighting professionals in working with Equity in Lighting's enrichment program at PS166Q in Queens. The program brings an exciting, hands-on STEAM learning experience to 4th grade students through the world of lighting. Over 8 weeks it introduces students to the science, technology, engineering, art, and math (STEAM) behind lighting — a subject they encounter every day, but may never have explored as a powerful tool for creativity, innovation, and problem-solving....

I have the great pleasure in joining other leading NYC lighting professionals in working with Equity in Lighting’s enrichment program at PS166Q in Queens. The program brings an exciting, han…

TM-30 and LP-30 at LightovationsThe IES is about to publish ANSI/IES LP-30 Lighting Practice: A Comprehensive Guide to ...
12/03/2025

TM-30 and LP-30 at Lightovations

The IES is about to publish ANSI/IES LP-30 Lighting Practice: A Comprehensive Guide to Specifying Color Rendition – Concepts, Criteria, and Implementation, which is essentially a user's guide to TM-30. The IES Color Committee worked on it for over two years to create an easy to read, comprehensive, phase-by-phase guide to integrating TM-30 into a designer's work flow. On January 11th I'll be giving a…...

The IES is about to publish ANSI/IES LP-30 Lighting Practice: A Comprehensive Guide to Specifying Color Rendition – Concepts, Criteria, and Implementation, which is essentially a user’s gui…

I recently received a set of lighting submittals. In them, one manufacturer had included TM-30 Full Reports. At first ...
08/20/2025

I recently received a set of lighting submittals. In them, one manufacturer had included TM-30 Full Reports. At first I was delighted, thinking, "Finally, a manufacturer who's made TM-30 a default part of their documentation!" Here's the report. My excitement was followed, a few seconds later, by a sinking feeling as I realized that the report was falsified and was a composite of at least two SPDs. ...

I recently received a set of lighting submittals. In them, one manufacturer had included TM-30 Full Reports. At first I was delighted, thinking, “Finally, a manufacturer who’s made TM…

Registration has opened for this year's ArchLIGHT Summit at the Dallas Market Center on September 16th and 17th. I'll be...
06/02/2025

Registration has opened for this year's ArchLIGHT Summit at the Dallas Market Center on September 16th and 17th. I'll be speaking twice. The first session on the 16th at 3 pm is titled The Language of Light. I'll be discussing how designing with light involves much more than understanding applications and footcandles. This seminar explores the many ways designers think about light as a design medium, describe light to themselves and others, and use light to create engaging environments....

Registration has opened for this year’s ArchLIGHT Summit at the Dallas Market Center on September 16th and 17th. I’ll be speaking twice. The first session on the 16th at 3 pm is titled …

I'm interviewed on this week's Get A Grip On Lighting podcast. You can listen, watch on YouTube, and more here.
04/03/2025

I'm interviewed on this week's Get A Grip On Lighting podcast. You can listen, watch on YouTube, and more here.

I’m interviewed on this week’s Get A Grip On Lighting podcast. You can listen, watch on YouTube, and more here.

I'm delighted to announce that my second book, Fundamentals of Energy Efficient Lighting and Controls, is now available ...
03/13/2025

I'm delighted to announce that my second book, Fundamentals of Energy Efficient Lighting and Controls, is now available for pre-order, and will begin shipping on April 3rd. The book grew out of a conversation with the Association of Energy Engineers (AEE) about their Certified Lighting Energy Professional (CLEP) credential. Early conversations included an interesting observation: there are several good books aimed at educating future lighting designers (including my own Designing with Light) and several good books aimed at educating energy efficiency professionals, but none that address energy efficiency in lighting with an eye toward maintaining quality lighting design....

I’m delighted to announce that my second book, Fundamentals of Energy Efficient Lighting and Controls, is now available for pre-order, and will begin shipping on April 3rd. The book grew out…

I'm pleased and proud to announce that my new book, Fundamentals of Energy Efficient Lighting and Controls, is available...
03/13/2025

I'm pleased and proud to announce that my new book, Fundamentals of Energy Efficient Lighting and Controls, is available for pre-order beginning today (March 13) and will begin shipping on April 3rd. The book grew out of conversations with the Association of Energy Engineers and their need for better study material for their Certified Lighting Efficiency Professional (CLEP) exam. This lead to an interesting observation: there are several good books aimed at educating future lighting designers (including my own…...

I’m pleased and proud to announce that my new book, Fundamentals of Energy Efficient Lighting and Controls, is available for pre-order beginning today (March 13) and will begin shipping on Ap…

ANSI C78.377 is the publication from National Electrical Manufacturer's Association (NEMA) that defines correlated color...
02/03/2025

ANSI C78.377 is the publication from National Electrical Manufacturer's Association (NEMA) that defines correlated color temperatures (CCTs) for LEDs. C78.377 has defined 10 CCTs (2200, 2500, 2700, 3000, 3500, 4000, 4500, 5000, 5700, and 6500 K). The recently released 2024 update adds definitions for CCTs of 2000 K and 1800 K for some outdoor and special indoor applications.

ANSI C78.377 is the publication from National Electrical Manufacturer’s Association (NEMA) that defines correlated color temperatures (CCTs) for LEDs. C78.377 has defined 10 CCTs (2200, 2500…

Earlier this month, CIE published CIE Position Statement on Color Quality Metrics, in which it recommends the lighting i...
01/21/2025

Earlier this month, CIE published CIE Position Statement on Color Quality Metrics, in which it recommends the lighting industry transition from the outdated and sometimes inaccurate General Color Rendering Index (CRI) to the General Color Fidelity Index (Rf ) defined in CIE 224:2017. The position statement notes that problems with CRI (which we've known about for years) include use of an outdated color space (CIE 1960 (...

Earlier this month, CIE published CIE Position Statement on Color Quality Metrics, in which it recommends the lighting industry transition from the outdated and sometimes inaccurate General Color R…

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