Traditional LED engines, with their fixed CRI values, have often left designers and gear providers with limited options. Despite the industry’s numerous attempts to address this shortfall, the ideal solution has remained elusive. Elation's TruTone Technology, however, bridges the gap in color accuracy and intensity thanks to Elation's esteemed Research & Development department, which spanned several years. The team, headed by Elation Product Manager Matthias Hinrichs, tackled the challenge of achieving the perfect balance between color accuracy and intensity, which has long plagued the entertainment lighting industry.
TruTone
The core concept behind TruTone is ingeniously simple yet profoundly impactful: a fusion of high and low white CRI LEDs into a single, high-density optical array that allows for CRI adjustments across a range from CRI 70 to 93. The system blends light smoothly with no switching or stepping and without visible artifacts or color temperature disruptions. Its advantage—the flexibility to adjust color rendering in a single fixture to cater to various lighting needs while presenting a new approach to fine-tuning the tone and depth of color—makes the system wholly unique.
Limitations in Previous Systems
Hinrichs played a pivotal role in TruTone’s development and said the journey began with recognizing the limitations inherent in existing lighting technologies. “Because LED lights often have a low CRI of 70, with discharge lights typically around 80, the light source is not great at representing the true colors of an object, which can appear dull, or in the case of skin tones, unnatural.”
Hinrichs said attempts have been made to address this with glass CRI filters that reduce the green component of the source, creating a warmer and more complete spectrum. “That is fine for a rock concert and other applications, but when lighting more critical environments like a fashion show, car show, television, theatre, or opera, for example, where the color rendering of costumes and sets is important, deficiencies in the spectrum appear.” Another CRI ‘fix’ has been using multi-color additive LED engines that make it possible to choose different LED emitters to blend and compensate for the missing frequencies. Hinrichs says this step achieved better results but was still not satisfying.
LED engines became available with a high CRI option of 90+, and manufacturers began offering high CRI versions of existing products or even replacement engines. “But that came with a drop in performance. As the CRI increased, the LEDs became less efficient, so you ended up with a 60-70% fixture of the original output,” Hinrichs explained.
For rental houses, the high CRI options meant they had to stock two different fixtures, and the high CRI versions would often sit in the warehouse for extended periods compared to average CRI stock. “That’s not great for business,” Hinrichs stated, noting that Elation decided early on to forgo dual fixture versions. “On the designer side, you had to be mindful of what you specified because if you speced all high CRI fixtures, you needed 30-40% more fixtures because you didn’t have the necessary light output. That’s also not ideal.”
What if…?
It was apparent that the crux of the issue lies in the inherent trade-offs between CRI values and performance, yet each solution presented its own set of compromises. Elation engineers then asked the question, What if, instead of settling for a fixed CRI value, we could offer users the ability to seamlessly adjust color rendering in a single fixture according to their needs—more horsepower or more color accuracy?
Elation R&D explored avenues for blending high and low CRI LEDs into a single, cohesive array, and a breakthrough came when separate drivers and electronics for each set of CRI LEDs were tested. Hinrichs explains, “Independent CRI engines eliminated the hard switch and allowed us to adjust the fixture to any CRI seamlessly we wanted. Because of the efficiency differences at each CRI point, we did a lot of math and optimization to get the blend of output and color spectrum just right while making sure that the color temperature remained stable when moving between the different CRIs.”
This fluid adjustment, facilitated by sophisticated algorithms and meticulous engineering, ensures optimal performance and efficiency along the 70 to 93 CRI range. A CRI of 70 aligns perfectly with many existing fixtures like the Elation Proteus Maximus and Lucius. At the same time, a CRI of 93 is ideal for applications where color accuracy is essential, like key lighting, theater, fashion, auto shows, TV/film, etc. Optimal efficiency is in the middle, at CRI 80, which is perfect for high-performance requirements.
Color Influence
The more engineers looked at the system, the more they realized its advantages. “When we scrutinized it, we looked at white light on a surface, a person, a costume, and it looked great, also skin tones,” Hinrichs recalls. “But we quickly learned that the system has a huge influence on the color mixing system as well. It allows you to shift colors from a cold balance to a warm one and create some beautiful, warm, theatrical colors. It’s an adjustment in fidelity and a new way of influencing color.” In short, changing the spectral composition of how color is built gives the designer an expanded range of color variations. “When we presented the feature to theatre and television designers, they could really see its advantages and were amazed at the palettes they could create.”
Unique Flexibility
Since the TruTone system enables the adjustment of CRI from a single fixture, it accommodates a broad spectrum of applications. It eliminates the need for multiple fixture variants to achieve precise color representation. Designers are now free to choose the type of LED engine they want. A lighting fixture can play a dual role in a single show. Whether it’s illuminating a presenter with high CRI key light and then repositioning to a rock band for full-on power looks or illuminating a car at an auto show and then repositioning onto a DJ at high output, TruTone’s seamless CRI transitioning is unique and is the only system in which this is possible.
Proteus Odeon and beyond
TruTone’s adjustable fidelity opens up a world of possibilities, allowing users to fine-tune the tone and depth of colors with unparalleled precision. Elation’s new Proteus Odeon framing profile moving head is the first lighting fixture to feature the new TruTone system, and the technology will be implemented into other Elation fixtures moving forward.
In closing, Hinrichs states, “TruTone has been years in the making, and we’re excited to bring this new technology to the market. I think when designers see the possibilities, they will realize the real impact it can have on their designs.”
