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Fixture vs. Area-Based Control: The Pros and Cons

  • 07.09.18
  • ::
  • By David Parrett

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In my last post, I highlighted the advanced features and benefits that differentiate the Cortet E100 gateway and put it in a clear leadership position in the market.

In this post, I want to share further thoughts about the difference between fixture-level and area-based control and considerations for lighting project design.

If you’re considering a move to networked lighting control, or you’ve already begun roughing in the project scope, you may be wondering: Is fixture-level control or area-based control the best choice?

This question is important for anyone who manages the lighting design of a building, as well as for utility efficiency program managers who are planning energy efficiency programs for commercial buildings.

To be clear, I won’t be delving into what the lighting  industry commonly refers to as Luminaire Level Lighting  Control (LLLC).

LLLC provides not only the fixture-level control, but also integrated occupancy and ambient light sensors. Rather, this blog will discuss control of one or many luminaires. The conclusions below are also applicable to LLLC, butproject economies get an even greater imbalance with the added costs of sensors for each fixture.

 


 More from David Parrett:

A Closer Look at the Cortet E100 Networked Lighting Control Gateway
Introducing Cortet Certified: Here’s How It Works
Why Over-the-Air Updates Are So Critical for Your Lighting Control Solution


Fixture-Level vs. Area-Based Control

It’s important to know that there are several approaches to manage a luminaire installation with wireless controls in a commercial building, and that most buildings will likely be served by blending these approaches.

So, let’s talk through the differences between them, and the pros and cons of each.

Area-Based Approach

Area-based control is accomplished when multiple luminaires are wired to a single switch or wireless fixture adapter.

In a wiring sequence commonly referred to as “daisy chain,” all the luminaires attached to the control adapter will operate in an identical manner.

However, this doesn’t mean that this approach keeps them from participating in whole building control, as network lighting controls allow for area-based controls to be included in larger zones virtually.

As you may have guessed, there are a few pros and cons for this type of design:

PROS

  •  Satisfies most situations. The area-based approach  is good enough for most spaces, since it meets design needs at a reasonable value sharing one control adapter across many fixtures.
  •  Simplifies configuration. This method also reduces  complexity with fewer end nodes to find and configure.
  •  Retrofits with ease. In the case of a retrofit, it offers  the ability to swap out a switch and control an entire  bank of lighting.

CONS

  •  Retrofit labor cost. In a retrofit situation, installers may need to run control wires, which adds labor cost to the equation.
  •  Less control. The area-based approach results in a  loss of control for individual "spots" of light, and instead creates “pools” of light.
  •  Less future-proof. If the layout of the space changes  in the future, it’s much more difficult to reconfigure the  lighting design.

Where it Makes the Most Sense

The area-based approach makes the most sense in a  bigger and more heavily trafficked space such as  ballrooms, hallways, classrooms or storage areas where large pools of light are perfectly acceptable, and where individual luminaire control would be a waste of time. Plus, these types of spaces generally will not require extensive reconfiguration or adaptation over time

Now, let’s visit the other type of lighting design approach.

Fixture-Based Approach

Fixture-based control is accomplished when each luminaire is wired to a single fixture adapter.

Network lighting controls allow for fixture-based controls to be included in larger zones virtually, but the luminaires maintain an ability to be controlled individually.

Of course, there are a few pros and cons on this type of lighting design as well:

PROS 

  •  Straightforward installation. Fixture adapters are  installed at each fixture, so control wires do not need to be installed between luminaires.
  •  Reconfiguration ease. As the building’s layout or  needs change over time, these types of control systems can be easily updated. It’s not uncommon in a tenant situation to have to change offices, whether adding cubicles or moving walls. If you have control over every fixture, you can use software to change the zones very easily.

CONS

  •  Cost. While individual fixture control is an attractive  element, the downside is the excessive cost if it’s not  completely necessary. From a value standpoint, this is  the least economical option.
  •  Start-up and Commissioning. A fixture-level approach means you have many more devices to configure, and this can take time and money if it’s not necessary for your scenario.

Where it Makes the Most Sense

When deciding to install fixture-based approach, consider  the density of fixtures and the activity beneath them. While an area-based approach may be better in an open-office plan, individual offices may do better with individual fixture control. Common spaces like lobbies and break rooms are always best when planned for area control, when you need to illuminate all or none. In more fixed spaces that tend to evolve, you may want individual fixture control.

There’s No One Correct Approach

When you need to decide which approach to take for your building or facility, know that one way is not necessarily better than the other.

Instead, consider how you can tailor the approach to your specific scenario. After all, you may choose to have greater control with a fixture-level approach in individual office settings, and an area-based approach in the  hallways and lobby.

Different solutions within different spaces in a single building makes more sense and lessens the cost burden.

Cortet Can Do Both

As you navigate your lighting needs, know that Cortet can provide solutions for both fixture-level and area control approaches.

By leveraging the Cortet solution, you can determine your building’s ideal lighting design and best plan for energy efficiency for years to come; choosing a tailored solution that makes the most sense for your space and budget.

For Next Time...

We’re getting a lot of questions about RF protocols, so I’ll break down some benefits of several leading contenders for wireless lighting control.

We'd love to hear your feedback, so please leave us comments below or send email to marketing@cortet.com. Also, be sure to subscribe to our email alerts and follow us on LinkedIn, Twitter and Facebook so you don't miss a thing.

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