Human-Centric Lighting in Marine Installations
How circadian lighting may help everyone aboard
April 23
Human-Centric Lighting in Marine Installations

We’ve spoken about this on the Crestron blog before: Artificial circadian light — illumination that mimics the color temperature of sunlight (or lack thereof) throughout the day and night — may impact sleep and other wellness factors in humans. Michael Meeneghan, owner of MP Tech Solutions, has focused on this field of study and applied it to his integration work in both marine and residential applications. In fact, Meeneghan has developed a design approach he calls “circadian architecture.”

“It’s the practice of creating a project to absorb as much natural light as possible from the moment you wake up,” he explains. “That would include big windows, loads of natural daylight, and, of course, shading.” The right blend of all those elements should harvest as much sunlight as possible while preventing unwanted solar heating and sun-bleaching of interior surfaces, finishes, and fabrics.

Modern human beings, however, spend a lot of time indoors — and that requires a technological solution. “Circadian architecture includes using artificial lighting in spaces where we cannot get enough natural light to replicate that natural light,” says Meeneghan. “And our favorite way of doing that is using DALI and tunable LEDs.”

The Fundamentals of Human-Centric Light

LED technology has paved the way for indoor, artificial light to mimic sunshine, most notably with its ability to change “temperature” throughout the day, from warm to cool. Understanding just how this works can be tricky, as evidenced by this explanation from Nick Boever for CE Pro magazine:

Color temperature relates to how eyes perceive certain tones of white light and this relates back to the color of sunlight at different points of time throughout the day.

Correlated color temperature (CCT) refers to the specific color wavelength a light puts out, measured in degrees Kelvin (K). This is the measurement you will see constantly to describe the color output of light, and it ranges between 1000K – 10000K with the lower temperatures representing warmer, redder lights while the higher temperatures represent cooler, bluer colors.

It may sound counterintuitive at first, but picture it in the way a flame burns. A red flame is the coldest flame possible and therefore has the lowest temperature while a blue or pure white flame has a very high temperature. The relative descriptors of warm for red and cool for blue are a little confusing given that description, though.

In a marine application — even with a yacht’s sun-drenched decks and tropical ports of call — Meeneghan believes artificial circadian lighting is a must.

Below Decks

Meeneghan, a Royal Navy veteran, understands what it’s like to crew one of these vessels. “When you’re working a superyacht, the days can be 14 hours long, and you’re probably living on caffeine,” he explains. “And those days can be even longer if you’re working on a charter.” It’s a job that requires accommodations which usually consist of “standard issue crew, two-man bunk,” says Meeneghan. “And they’ve got a tiny porthole, which is usually never open and probably cluttered.”

From bunk to bath to mess to getting dressed for the day, the crew is likely subjected to poor-quality LED light, somewhat controllable where they sleep but brilliant white in common areas. “You’re compounding the stress of the job with a barrage of unnatural light, and that’s not an ideal situation.” A superyacht crew responsible for everything from safety to five-star service must be at the top of their game.

That approach, of course, should extend well beyond the crew’s quarters. “I was on a yacht in Florida, conversing in the vessel’s saloon, and stepped out on the deck to take a call,” Meeneghan recalls. It was daytime, and Meeneghan was struck by how his mood seemed to suddenly elevate the moment the light struck his face. “To then return to a darkened, cavernous part of the ship was a huge letdown.” For Meeneghan, a consistent light experience throughout a yacht based on the cyclical nature of sunlight is imperative — it’s as refreshing as it is invigorating, which benefits both those who are aboard to relax as well as those who are there to work.

Super Yacht Vertigo
Super Yacht Vertigo
Mega Yacht My Savvannah
Mega Yacht My Savvannah

The Right Scenes and Control

Meeneghan has tried different approaches to automating lighting on yachts. “It’s never a one-size-fits-all scenario,” he notes. He recalls one client who had warmed to the idea of sensors that picked up exterior light levels and mimicked those conditions indoors. “That worked fine until she wanted to read inside a stateroom on a cloudy day,” he says. His experience has led him to create four basic lighting scenes that he can program into a yacht’s lighting control, and owner, guests, and crew can call those up manually. “You always have to build that flexibility into the system, even those with the most advanced automated functions — life changes, right?” This is a big benefit of Crestron control solutions for Meeneghan: “It’s very easy and intuitive to call up a desired scene.”

With more yachts traveling north, Meeneghan notes that the need for artificial circadian light becomes pronounced. “In the tropics, in the Mediterranean, and so on, the transition between night and day is pretty ‘clean’ — sunlight, twilight, darkness. When you’re ailing around, say, Scotland, that transition becomes much less pronounced given the weather we’ve got,” he says. “The ability of a platform like Crestron Home OS to manage circadian rhythms is fantastic for just this purpose: We set those values based on the client’s desires and the needs of the crew, and then we’re all set.”

As Meeneghan notes above, DALI® standard is a great way to control tunable white LED lights. And the good news is that Crestron is going to launch a new DALI gateway this summer: the Crestron DIN-DLI, a next-generation DALI lighting controller designed to simplify complexity for integrators and bring the beauty of dynamic lighting right to a user’s fingertips. The DIN-DLI makes integration even smoother, and the gateway is smaller than the current options, saving space in lighting cabinets.

More Options

In addition to solutions that leverage a well-adopted communication protocol such as DALI, Crestron offers a second control option: the DMX-C LED lighting driver. DMX-C sets itself apart from DALI when it comes to ease of deployment and the speed of the system when changing scenes or adjusting colors, especially with RGBW LED light sources. Another Crestron partner, Savage Marine (based in Leicestershire, UK), manufactures DMX-C compatible fixtures specifically for the yachting market (learn more here). Savage Marine is currently in the process of constructing a new factory and will expand their range of DMX-C solutions as soon as the facility’s up and running.

Meeneghan has found that while clients often opt for circadian solutions in new ship builds — “Those clients often want the latest and greatest,” as he puts it — refits are a different story. “You do have to make the case for this kind of solution when budgets are a bit tighter, and we’ve found that seeing is believing,” he says. “We’re more than happy to meet a client aboard their vessel and fit a single cabin with the solutions we provide, and most often, they’ll opt for an upgrade.”

In fact, Meeneghan has had a similar experience on an even smaller scale: “I can show a client and their designer a swatch of color in the sunlight, then illuminate it with a cheap LED and a more expensive, properly-tuned luminaire, and you can see that immediate ‘Oh, wow’ reaction — yes, we can bring the sunshine inside for you.”

“And if I can do that with one lamp, what can we do throughout the whole boat?”

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Crestron Home® OS

With Crestron, everything in the home is controlled with ease on one intelligent platform. Your home becomes more secure, comfortable, and convenient.

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Residential Lighting

Your body runs on a 24-hour cycle called a circadian rhythm. Lighting affects one major aspect of it: your sleep-wake cycle. Replicating natural light provided by the cycles of the sun with artificial light can improve your mood, concentration, creativity, and energy levels, as well as promote better sleep. This can be accomplished using tunable LED light fixtures and technology such as the Crestron SolarSync® photosensor.

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Marine Solutions

From flawless control and distribution of audio and video, to seamless integration of lighting, shades, climate, and navigation systems, we provide an elegant, connected lifestyle of comfort and convenience at anchor, in the marina, or at sea.

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