Why conventional zonal lighting controls do not save energy

Many offices are turning to lighting control systems to reduce their energy costs and carbon footprint. Unfortunately, many of them opt for outdated zonal control timers. Conventional zonal lighting control has many limitations, but the most important concern is the inability to actually reduce lighting energy use.

This paper discusses these flaws and helps you to rethink your assumptions about zonal lighting control. First, we shall look at two defining features of conventional lighting control; online vs. offline and zonal size.

Offline versus Online

Zonal control systems are typically offline – they run on simple 7-day schedule cycles and need to be calibrated manually. Moreover, any change to the zoning layout requires physical rewiring of your lights. This offline work is inefficient, expensive, and error-prone.

One customer who had used a zonal lighting timer found out the hard way that their timer didn’t know when it was a holiday. Their lights were being turned on all day long during public holidays when the office was empty.

Offline versus online

Online systems can automatically detect public holidays and activate special schedules. Moreover, they can be quickly and easily edited on any web-enabled device, so your schedules can adjust and adapt over time to meet your needs. If you have fixture-level control, you can even rezone your entire office via any web browser, without any professional help.
 

Zonal size matters

The size of your unit of lighting control significantly affects how the system works and saves energy. If the entire office is controlled together, then just one person out of 100 working overtime means all the lights must be on. Typical zonal control systems group 30-50 light fixtures together in a zone with around 25 workstations. All 25 of those occupants must leave before a single light in that zone can turn off.

With individual fixture control, however, you can turn lights on or off one by one. So if one occupant is on leave, you can turn off the light above their desk for the whole day. And if one occupant works late, you can turn off all lights except for theirs. This level of precision and efficiency enables significantly higher savings.

Does conventional zonal lighting control save energy?

Let’s look at how office lights operate during a typical workday in a modern office. Here are 7 areas where conventional zonal control waste energy. We compare the difference with using En-trak Smart Lighting.

 

No.

Scenarios

Zonal Control

Smart Lighting

1.

Staggered staff arrival

All lights or large zones are turned on as soon as the first person arrives.

Lights are turned on by individual staff as and when they arrive.

2.

Staff on leave

Their desks are illuminated anyway, there is no way to turn them off

The lights above their desk are turned off for the whole day

3.

Staff working away from office

Their desks are illuminated anyway with no way to turn them off

Granular control ensures the lights above their desk are turned off for the day

4.

Over-lit corridors

All corridors are fully lit

Alternate corridor lights can be scheduled to turned off to save energy while still keeping safe and comfortable lighting levels

5.

Lunch break

All lights are either on or off. If someone needs to work, they either sit in the dark or override to turn on a large zone of lights.

All lights off by default, but any staff in the office can keep their individual lights on, so nobody feels the need for a full override.

6.

Staggered staff departure

Lights remain on in each zone until the last person leaves

Lights turn off one by one as staff leave the office, leaving only a selected few on for overtime workers

7.

Night time

Lights in areas outside of zonal control could be left on accidentally (typically meeting rooms)

Lighting in all areas is turned off completely by schedule.

And this is a snapshot of energy consumption before and after smart lighting is installed in the office.

Snapshot of energy consumption before and after smart lighting

How does smart lighting avoid these problems?

We focus on five core areas to ensure that our lighting control system is the best in the market for modern offices:

1. Individual fixture control

Whether controlled by sensors, schedule or switch, the smaller the unit of control, the higher the savings. En-trak is the only cost-effective solution that allows individual fixture control to deliver savings that are impossible to achieve with zonal control.

2. Universal application with any existing lightings

En-trak Smart Lighting is easy to manage, understand, and install. It can be applied to all areas of your office to help your entire office save energy. What’s more, En-trak Smart Lighting can be used on any of your existing lighting. It is perfect for any retrofit projects.



3. Quick & easy installation

Zonal control can be expensive to install, with wiring for different zoning layouts which must be fixed before installation. En-trak Smart Lighting is very simple to install–on average 6 minutes per controller. Configuration is easy and admin users can re-zone their office lightings, anytime, anywhere, without any costly rewiring.

4. Flexible configuration

Your office usage may change over time. To maintain savings, your lighting control system needs to change with it. Costs can skyrocket if that change requires engineering work or expert configuration. That’s why we make sure 100% of configuration, from schedules to zoning to staff assignments, can be done through an intuitive web portal.

5. Optimum payback

You deserve to get the most out of your energy saving investments. We work hard to ensure that your savings will be significant enough to deliver a strong return on your lighting control investment. By focusing on what drives savings, En-trak Smart Lighting provides the best office lighting control system in the market.


About En-trak

En-trak is an award-winning cleantech IoT company. We design and sell cloud-based solutions to help enterprises manage and optimize their energy consumption. Our flagship solution En-trak™ Energy enables users to know where, when and how they are using energy in real-time.

With continuous monitoring and advanced analytics, we’ve helped over 250+ world-class clients including Hong Kong Stock Exchange, National Environmental Agency, and Fuji Xerox achieve their sustainability goals. We’ve also recently launched our brand-new, patented En-trak™ Smart Lighting solution designed to help companies and building owners to automate and optimize their office lights.