The LED industry is in the midst of a rapid development cycle. In an effort to lengthen bulb lifetime, intensify colors, and create higher energy efficiencies, manufacturers are developing LEDs at an intense rate.
To help Building Team members sort through the new technological dimensions of LEDs, we asked two top-rated LED experts—John W. Curran, PhD, president of LED Transformations LLC, an LED industry consulting firm based in Stanton, N.J., and Glenn Heinmiller, principal of LAM Partners Inc., an architectural design firm based in Cambridge, Mass.—for their advice.
1. Pencil out the economics of LEDs. Building Teams should evaluate the economics of deploying LED luminaires. Cost savings come from two factors: energy efficiency and long life. The higher the electric utility rate for the application, the faster the payback. A long lifespan provides reduced maintenance costs resulting in additional savings. “The LED fixtures must last as long as assumed in the ROI calculations,” says Curran. “This is often where the economics for LED fixtures falls apart.” According to Curran, Building Teams must also be careful not to assume a lifetime that the fixtures do not deliver due to bad information from the fixture manufacturer or misapplication by the specifier or contractor.
2. Determine if LEDs are the right application for your building. “The answer depends on the specific lighting application, local electricity rates, operating hours, maintenance costs, and availability of utility incentives,” says Heinmiller. Building Teams should help owners explore the length of the payback period versus best energy performance regardless of upfront cost.
3. Consider the physical environment immediately surrounding the LEDs. Very high-temperature environments can present problems for LED technology. For example, installing highbays in an uncooled warehouse in Arizona may result in greatly reduced lifetimes for the LEDs. Those same highbays in a cold storage facility will perform much better.
4. Be aware that dimming is still a major problem with LEDs. Not all LED products can be dimmed, and those that can may not dim smoothly or to a low level. This is due to the widespread use of phase-cut dimmers in concert with conventional incandescent lighting and the drivers—the electronics—that power the LEDs. “It’s not easy to predict how a particular driver will perform against a wide range of dimmers already installed,” says Curran. Currently, there are no standards for LED dimming control, so only certain types of dimmers or dimming protocols will work with a particular LED fixture. “Dimming problems will probably improve some with technology development, but there are no signs the industry is standardizing on a dimming protocol,” says Heinmiller.
5. Test the LED color rendition. “The color rendering performance of white LED sources is generally quite good,” says Heinmiller. “Testing is important, especially for applications where color rendition is crucial, in order to make sure you are satisfied with the results.” Eventually, there will be an improved color metric that will predict quality more accurately from the specifications. Until then, Building Teams should advise clients to test color-critical applications.
6. Check out the fixtures with the manufacturer. Ask the LED manufacturer about their quality control and the type of testing done on their drivers. Deal only with reputable suppliers and manufacturers: What good is a 10-year warranty when the supplier goes out of business in a few years? Ask the supplier how they plan to provide replacement fixtures in 3 to 5 years.
7. Look for the Lighting Facts label. Go to www.lightingfacts.com to learn about a U.S. Department of Energy program that showcases LED products for general illumination from manufacturers who commit to testing products and reporting results according to industry standards. The LED Lighting Facts label can provide Building Teams with essential information for evaluating products and identifying the best options.
8. Go with a pro. For complex projects, engaging the services of a qualified professional architectural lighting designer could save your client—and you—a lot of money and grief. “It is a complex problem to determine the correct light source for the application in order to achieve the best energy efficiency and high lighting quality,” says Heinmiller. If you focus only on lower energy efficiency, you could end up with a lower electric bill but poor lighting in your building—or worse, no savings and poor lighting. For projects such as relamping existing track lighting in a retail store, working with a respected manufacturer’s representative who supports mockups and stands behind the supplier’s LED products is probably sufficient.
What are OLEDs?
Organic light-emitting diodes (OLED) are a separate branch of solid-state lighting that are beginning to have an impact on the architectural lighting industry. “The major performance difference between LEDs and OLEDs is that LEDs are point light sources while OLEDs are area sources,” says Curran, president of LED Transformations. LEDs are much further ahead in regard to cost, higher efficiencies, and longer lifetimes. Currently, OLEDs are used in cell phone displays and a small but growing number of high-end designer lighting fixtures.
Learn more about LED standards
• ANSI C78-377-2008 Specifications for Chromaticity of Solid-State Lighting Products for Electric Lamps. ANSI C78-377-2008 provides a standard for qualifying the range of colors that can be classified a particular color temperatures.
• LM 79-08 Approved Method: Electrical and Photometric Measurements of Solid-State Lighting Products. LM 79-08 gives the proper test procedure to evaluate light distribution and power consumption for an LED fixture. LED fixtures require special testing (using absolute photometry) because LED light sources, unlike traditional sources, cannot be tested independent of the fixture due to thermal effects on performance.
• LM 80-08 Approved Method for Measuring Lumen Depreciation of LED Light Sources; and TM-21-11 Projecting Long-Term Lumen Maintenance of LED Sources. LM-80-08 and TM-21-11 provide guidance on measuring and predicting the lumen depreciation of LED devices, which yields an estimate of useful lifetime.
Related Stories
Mass Timber | Jan 30, 2023
Net-positive, mass timber building will promote research on planetary well-being in Barcelona
ZGF Architects, along with Barcelona-based firms MIRAG and Double Twist, have designed a net-positive, mass timber center for research on planetary well-being. Located in Barcelona, the Mercat del Peix Research Center will bring together global experts in the experimental sciences, social sciences, and humanities to address challenges related to the future of the planet.
AEC Tech | Jan 27, 2023
Epic Games' latest foray into the AEC market and real estate industry
From architecture to real estate, the realm of computer-aided design hits new heights as more and more firms utilize the power of Epic Games’ Twinmotion and Unreal Engine.
University Buildings | Jan 27, 2023
Ozarks Technical Community College's advanced manufacturing center is first-of-a-kind in region
The new Robert W. Plaster Center for Advanced Manufacturing at Ozarks Technical Community College in Springfield, Mo., is a first-of-a-kind educational asset in the region. The 125,000-sf facility will educate and train a new generation in high tech, clean manufacturing and fabrication.
Mass Timber | Jan 27, 2023
How to set up your next mass timber construction project for success
XL Construction co-founder Dave Beck shares important preconstruction steps for designing and building mass timber buildings.
Sports and Recreational Facilities | Jan 26, 2023
Miami’s motorsport ‘country club’ to build sleek events center
Designed by renowned Italian design firm Pininfarina and with Revuelta as architect, The Event Campus at The Concours Club will be the first and only motorsport-based event campus located within minutes of a major metro area.
Student Housing | Jan 26, 2023
6 ways 'choice architecture' enhances student well-being in residence halls
The environments we build and inhabit shape our lives and the choices we make. NAC Architecture's Lauren Scranton shares six strategies for enhancing well-being in residence halls.
K-12 Schools | Jan 25, 2023
As gun incidents grow, schools have beefed up security significantly in recent years
Recently released federal data shows that U.S. schools have significantly raised security measures in recent years. About two-thirds of public schools now control access to school grounds—not just the building—up from about half in the 2017-18 school year.
AEC Tech Innovation | Jan 24, 2023
ConTech investment weathered last year’s shaky economy
Investment in construction technology (ConTech) hit $5.38 billion last year (less than a 1% falloff compared to 2021) from 228 deals, according to CEMEX Ventures’ estimates. The firm announced its top 50 construction technology startups of 2023.
Sports and Recreational Facilities | Jan 24, 2023
Nashville boasts the largest soccer-specific stadium in the U.S. and Canada
At 30,105 seats and 530,000 sf, GEODIS Park, which opened in 2022, is the largest soccer-specific stadium in the U.S. and Canada. Created by design firms Populous and HASTINGS in collaboration with the Metro Nashville Sports Authority, GEODIS Park serves as the home of the Nashville Soccer Club as well as a venue for performances and events.
Concrete | Jan 24, 2023
Researchers investigate ancient Roman concrete to make durable, lower carbon mortar
Researchers have turned to an ancient Roman concrete recipe to develop more durable concrete that lasts for centuries and can potentially reduce the carbon impact of the built environment.