The Strength of TM-30

Last week Tony Esposito and I presented seminars at ArchLIGHT Summit in Dallas, TX. The topic was TM-30 and the deep information that it provides us about a light source’s spectrum and the resulting color rendering. CRI, of course, only evaluates fidelity – how close a light source matches its reference light source. But CRI penalizes all deviations and says nothing about the rendering of individual colors. Nor does it help us understand if the deviations from the reference are acceptable to viewers.

A small part of our demo is shown below. It illustrates how two light sources can have the same fidelity (in this case Rf of 70) but wildly different spectra that produce wildly different color rendering results. This is the great strength of TM-30, a deeper insight into the effect of a light source on illuminated objects and their color appearance – not just fidelity, but chroma shift, hue shift, and the perceptual implications of those shifts.

The video below shows the color appearance shifts. The graphic illustrates that even though the Rf is 70, the first light source renders objects in a preferred manner (Preference Priority Level of 3 or P3) and increases vividness (Vividness Priority Level of 2 or V2). At the same Rf the second source mutes colors and fails to achieve any of the Design Intents and Priority Levels specified in TM-30’s Annex E.

Alternating between light sources with Rf 70, Rg 94 and Rf 70 Rg 111

Studio T+L’s Shakespeare Challenge

Last weekend a group of us were having Zoom Cocktails.  We were talking about the quarantine challenges we had tried.  30-day yoga challenge (failed!).  30-day cocktail challenge (passed!).  We were also talking about having exhausted the offerings on Netflix, Prime, etc.  We agreed that Broadway HD is a good option, although sometimes clunky and prone to freezing.  Then we came up with a new one: The 38-week Shakespeare Challenge.  Read one Shakespeare play a week until we’ve worked our way through them all or we’re all released from confinement and can go outside again.  Here are the details.  Join us!

Do I have to buy the Complete Works of Shakespeare?  

Actually, no. There are plenty of places online where you can get Shakespeare’s plays for free.   You can go to your library (if it’s open) or an online library like the Internet Archive Open Library.  One of the best is the Folger Shakespeare Library which has each play available to read online, in a variety of formats for download, and about a half dozen plays as audiobooks.

Do I have to read the plays?

Again, no!  So many of the plays have been made into movies.  Watch the 1973 Antony and Cleopatra with Charlton Heston if you like.  Watch two versions and compare and contrast.

What are the plays, and what is the order?

We’ve decided to use the RSC’s Timeline of Shakespeare’s Plays.

Do I have to watch movies of the plays?

No again!  Do you want to watch Kurosawa’s Ran instead of King Lear?  Go for it!

Are there other options?

Of course!  Watch West Side Story or Kiss Me, Kate instead of Romeo and Juliet or Taming of the Shrew.  Let’s face it, they’re going to be better than a lot of the alternatives.

I hate book clubs.  Do we have to talk about this stuff?

First, you’re really difficult.  Second, yes but just a little bit.

LEDucation Postponed

Due to growing concerns of COVID-19 in the lighting industry and the New York community, the Designers Lighting Forum of New York is postponing the LEDucation 2020 Trade Show and Conference that had been scheduled for March 17 – 18.

LEDucation is being rescheduled to August 18 – 19, 2020.  I expect that our TM-30 Annex E seminar and demonstration room will be part of the rescheduled event.

LEDucation Update

LEDucation this year is on March 17 and 18 at the New York Hilton Midtown where our Jason Livingston be part of two presentations.  The first, at 9 am on Tuesday morning with Wendy Luedtke of ETC, is a seminar called Specifying Color Rendering with TM-30’s New Annex E.  The session presents the new ANSI/IES TM-30 Annexes E and F, which apply recent research to identify three color rendering design intents (Fidelity, Preference, and Vividness) and provides specifiers with TM-30 values to achieve them alone or in combination. Our goal is to increase awareness of Annexes E and F and to help attendees better understand their contents and use. The seminar is most appropriate for people with some prior knowledge of TM-30, although there will be a brief TM-30 overview for those who are new to the topic.

Then, on Wednesday, we’ll be joined by Jess Baker of Schuler Shook for a daylong demonstration of Annex E.  In the TM-30 Demo Room visitors will experience an immersive mockup illuminated with a variety of light sources illustrating the Annex E design intents. The lighting demonstrations will be paired with TM-30 values to show how TM-30 can be used to select light sources for each intent. Visitors will experience sources that meet different levels of the IES TM-30 specification guidelines outlined in IES TM-30-18 Annex E.  We’ll be presenting the demonstration on the hour and half hour from 9 am to 2 pm.

You can register to attend LEDucation here.