6 Bright Ideas for Retrofits
If you find your lighting quality is insufficient, there are a number of retrofits that can address occupant satisfaction. Consider these quick fixes:
1) Personal Controls
Make tenants happy by giving them some control over their space. The more choices occupants have to customize their lighting, the more likely they will find a happy balance in their space. And optimized work environments should yield more productive employees and fewer complaints, adds Woofter.
Occupancy sensors are great for saving energy, but remember they don’t address light quality. Dimming is one of the simplest ways to immediately improve lighting comfort. Rather than a choice of on or off, an occupant can gradually transition light levels to the task at hand, says Manning.
Not every fixture is compatible with dimming, so you may need to upgrade ballasts or put in new wall controls. If you’re considering LEDs, many newer models have dimming capabilities standard on them, says Havira.
2) Daylight Coordination
Numerous studies have shown that daylight is the optimal source of illumination. Whether you have a glass curtainwall, large windows, or skylights, coordinate your existing daylighting sources with electrical fixtures so they don’t compete.
“The warm cast of an incandescent may be desirable, but it could also fight with the cool tones of daylighting throughout the day. If the sun goes behind a cloud, for example, occupants may be distracted by the change in light color within their workspace,” Manning explains. “Try using cool lighting near windows.”
Windowless spaces can also benefit from cool lighting because the blueish cast can mimic sunlight. People will stop making jokes about working in a dungeon or cave (unless, of course, that’s what they prefer).
You can also rearrange your space so more people have access to daylight. If the main population of your workers doesn’t have exposure to natural light, your business efficiency could be suffering.
“Traditionally, executive and managerial offices are located around the perimeters and common areas grouped in the center,” explains Woofter. “Now companies are trying to ensure daylight equality by positioning common workspaces near windows and moving specific offices or meeting spaces into the interior.”
This strategy is already rewarded in many green building certifications because of the human health benefits, particularly LEED and Green Globes. Let those enviable corner offices with the beautiful windows become available to workers of any rank.
3) Window Treatments
Access to natural views is an attractive feature for any building, but daylight has its caveats. While windows can let in bountiful streams of light, they can also bring in unwanted glare and solar heat gain.
“Companies need to be mindful if they’re going to position people in workspaces directly adjacent to windows,” cautions Woofter. “Glazing can alleviate these complications. Thermal film on south-facing windows, for example, will still let the light through while bouncing off the heat.”
If you have a new construction project, you can use daylight modeling to capitalize on orientation (see the example of the Valley Hi Library). Predictive modeling shows the path of sunlight throughout the day, Manning explains. You can anticipate heat and glare with overhangs, tinting, light shelves, or other exterior shading devices.
For multistory buildings, tailor your glazing strategy on a floor-by-floor basis.
“You can use vision glazing on the ground floor with shades, for example, but those above may have a modest amount of daylight glazing so light penetrates deeply,” says Manning.
Sometimes a standard blind is better than no glare control at all. If you’re worried about occupant preferences overriding energy measures, there are automated systems that will respond to daylight cues.
4) Standardize Fixtures
Ever walk into a space and notice mismatched lights? The discrepancy isn’t just distracting for those who look up at the ceiling – the patches of different light can result in poor lighting for those working below.
“I’ll go into a facility and routinely find a group of inconsistent light fixtures. Some will have a blue cast and others are yellow. This usually happens because bulbs have been individually replaced over the years with whatever is on hand,” Manning recounts. “Make sure to standardize the color temperature of the lighting when you relamp. Otherwise you could be using bulbs that weren’t designed for the space.”
If you are satisfied with a lamp’s output and CRI yet there are still occupant complaints, try addressing its cast. You can add reflectors to standard 2x4 fixtures to improve spread and distribution, suggests Havira.
5) Task Lighting
Never underestimate the power the humble task light. These secondary light sources can range from a side or table lamp, torchieres, wall sconces, or track lighting. They can even include fixtures integrated directly into the workstation, such as underneath overhead storage. The key is that occupants have multiple lighting sources to choose from and they can use them at will.
Many companies also encourage a bring-your-own-lamp policy. While this places the cost of additional lighting on workers, it also affords them the greatest degree of personalization.
When was the last time you gave your lighting fixtures a good dusting? If it’s been a few years, accumulated dust and grime could be dimming the cast. A deep cleaning may be enough to make a perceptible difference.
You should also stay on top of maintenance and keep replacement records. Light quality depreciates over time and lumen output can wane long before the bulb goes out, notes Havira, particularly with metal halide and high pressure sodium.
Calculate Value on Investment
Most lighting projects are driven by energy efficiency or green building certification goals. This is the perfect opportunity to include an IEQ evaluation and improve the health and engagement of your occupants.
While the benefits of quality lighting may ride on the coattails of energy savings, there are productivity and satisfaction targets you can document as well.
For retail settings, look for sales growth. “We had a chain of convenience stores that upgraded their interior lighting from fluorescent to LEDs. This one change caused up to a 23% increase in purchases,” Havira recalls.
You can also quantify the benefits by looking at error rates, particularly for warehouse and distribution applications. Usually error rates will decline when lighting improves, Havira stresses, and the same goes for accidents.
If you want to show an improvement in occupant satisfaction, make sure you distribute a before-and-after survey. It’s imperative to have a snapshot of worker complaints before you make adjustments. You can also collaborate with your HR department to review absenteeism trends and employee turnover.
Compared to reducing your utility bill, fewer occupant complaints may seem like a secondary benefit. But if your building design can improve productivity, it’s a win-win for the entire business.
“With lighting, we often focus on the savings associated with energy efficiency. But people forget that a small gain in workplace satisfaction can dwarf any kind of utility savings,” Manning argues. “When looking at costs per square foot, you might find that a single office worker is $300 whereas energy is only around $2. Even a 1% improvement in productivity can be a greater cost savings than a 50% energy reduction.”
Jennie Morton is senior editor of BUILDINGS.