What are your priorities for your next lighting project? Are you aiming for energy savings? Is the constant need to replace failed lamps cutting into the time you could be spending on other maintenance? Or are you just not happy with the quality of your existing light sources?
LED lighting could help solve these issues. This ultra-efficient light source is more affordable than ever thanks to plummeting component prices and energy efficiency incentives. If you’re thinking about taking the plunge, make sure your LED retrofit delivers maximum value with these tips.
1) Define the Problem
What issue are you trying to solve with an LED retrofit? Are you mainly prioritizing energy savings, or are there other problems that the new installation needs to solve too? The General Services Administration (GSA) recommends asking yourself these questions to help define your needs:
■ Is the space already overlit?
■ What are your current and future lighting needs?
■ How long do you plan to occupy the space?
■ Do you want to incorporate sensors into fixtures?
■ What control capabilities are you looking for, even beyond your lighting system?
For the Waukesha (WI) School District’s natatorium, energy savings was a high priority, but the need to improve lighting conditions was also urgent. The existing metal halide fixtures had a half-life of about 8,000 hours, by which point they would lose around 40% of their original light output, says Jeff Gatzow, Vice President of Optec LED Lighting, which manufactured and installed the new LED lamps used in the natatorium project. Bringing in a lift to change the lights was so needlessly complicated that the bulbs typically wouldn’t be replaced until they failed, which created a safety issue, notes Tom Cherone, Master Electrician for the Waukesha School District.
“The maintenance was also extremely time-consuming. We had to shut the pool down because you can’t have people around when you’re working with an aerial lift,” Cherone says. “The fixtures were tempered glass – if the glass breaks and falls into the pool, you don’t have a lot of options other than draining it, which becomes extremely expensive when you have to pay for sewage and water fees to refill 480,000 gallons. With the new LED heads, each one is a sealed unit and the components are sealed as well so if they do fail, it’s a simple operation to just drop the head and put a replacement in its place.”
To get a handle on your building’s needs, Vikrant Mahajan, Product Marketing Manager for OSRAM SYLVANIA, recommends assessing every space in the building to examine existing light levels, control requirements, maintenance expectations and other factors that could impact your LED choices. One way to do this is with a comprehensive audit that accounts for every light source in your building. Juliann Rogers, Director of Energy for CKE Restaurants Holdings Inc., oversaw an audit and LED retrofit of 204 Hardee’s and Carl’s Jr. restaurants nationwide. The company is participating in the DOE’s Interior Lighting Campaign, which encourages FMs to install high-efficiency lighting and has set an initial goal of 1 million efficient troffers installed by May.
“We had retrofitted several dining rooms with LED kits two to three years ago. We didn’t want to tear those down and reinstall them because they were still fairly new, so I provided my auditor with a scope of work that said to audit the kitchen only in any restaurant where we’d already retrofitted the dining room,” Rogers explains. “I would recommend having them audit the entire restaurant. If a fixture is LED already, they can make a note about that, but at least you’ll know.”
2) Understand Unique Challenges
Special spaces may have more requirements than a standard office. For example, the natatorium project required fixtures that were IP rated for at least a damp location. “Even though it’s a controlled environment with air conditioning and dehumidification, humidity still creates a problem,” Cherone says. Preventing glare was also crucial for safety and navigability, so Optec used an indirect lighting strategy where the light was angled onto the ceiling first and then back down into the water to ensure the pool was adequately lit while minimizing glare.
Weather and the ability to stand up to tough kitchen environments were crucial considerations for the Hardee’s and Carl’s Jr. retrofits, Rogers notes. She sought out recommendations from trusted suppliers who were familiar with the restaurants’ needs.
“A lot of new fixtures don’t have a removable lens, but in the Southeast, bugs will get into fixtures no matter how airtight they are. We need to be able to remove lenses for cleaning,” Rogers says. “We chose to go with whole fixture replacements instead of retrofit kits due to the warranties and the price on the troffers, which were nearly equal to the kits. We also needed several different varieties of the same fixture – for example, a 2-by-4 troffer also needs to come in 1-by-4s and 2-by-2s and look the same.”
3) Customize Solutions to Every Application
Use the audit results and your assessment of your own needs to further narrow your lighting options. Rogers used footcandle measurements to select fixtures after determining that the restaurants needed 30-50 fc in the dining room and 80 over the order counter and in the kitchen area.
“The biggest challenge was figuring out what fixtures would work under awnings. We have a lot of different types of awnings, and you can’t just look at lumens per watt to be confident that a fixture will illuminate the awning from top to bottom and wash the wall – you have to actually install them to determine that,” Rogers says. “I also did a lot of testing to make sure the color temperature was right for our signs and menu boards. Depending on your color schemes, some Kelvin temperatures will wash out the colors.”
Bill Conley, an IFMA Fellow, LEED AP and facility manager whose organization is participating in the GSA’s Interior Lighting Campaign, found significant overlighting on the exterior of the three 100,000-square-foot facilities on his site. Right-sized retrofits for overlit areas can save even more energy and money than a simple like-for-like exchange could.
“Make sure you’re putting appropriate lighting in appropriate places,” suggests Conley. “One of the major challenges I see in the workplace, especially with retrofits, is that everything is replaced with the same intensity of light. You don’t need the same type of lamps in every area – for example, in Research & Development, we need 72 footcandles at the desktop because they do fine work, but we don’t need 72 footcandles at the floor level in the warehouse. Don’t take a cookie cutter approach. Figure out what your needs are and what lamp fits that need.”
4) Review Product Design
GSA recommends doing a mockup for all retrofit projects, especially if the replacement lamps will use the existing sockets. “For one-to-one replacements, compare light distribution to determine if the light levels will be comparable when switching from an omni-directional (fluorescent) to a directional (LED) light source,” GSA suggests. “Use the mock-up to assess the complexity of re-wiring for a retrofit lighting system.”
There are pros and cons to using the existing infrastructure, Conley notes: “If you use an existing ballast, you have ballast replacement to be concerned with, but if you go without it, you’re dealing with direct electricity because the ballast acts as a buffer,” he explains. “If you use drivers, that costs more and the drivers likely don’t have the same life that the LED lamp itself has, so you’re looking at replacement again.”
Whether or not you choose to use existing ballasts, GSA recommends specifying products that can adequately dispose of heat because high temperatures can damage LEDs. “It’s best to ensure the installing contractor follows the manufacturer’s instructions in regards to clearances and ambient operating temperatures,” the agency adds. “Make sure to test and spot check your inventory to scan for driver issues or other non-obvious manufacturing defects.”