Light-emitting diodes (LEDs) have become so prominent in so short a time that new standards and specifications are emerging faster than most engineers can gain familiarity with them. Prime among those are standards involving overcurrent and overvoltage protection from such organizations as the International Electrotechnical Commission (IEC), the Institute of Electrical and Electronics Engineers (IEEE), Underwriters Laboratories (UL), and the US Department of Energy's Municipal Solid State Street Lighting Consortium (MSSSLC), among others.
Experts say that most designers have a rudimentary understanding of the technical protection requirements for LED-based systems, but often need to be schooled on the details.
"Engineers know surge immunity," Usha Patel, director of the Latin American sales and segment marketing for Littelfuse Inc., told Design News. "They know they have to protect against lightning. They know they have to protect against inductive spikes. But there are areas where they still need to be educated."
The need to know involves many factors. Without protection, overvoltages and inductive spikes can damage sensitive electronics. And lack of understanding can cost money up front.
Patel, who has been involved with a DOE task force and other organizations on the creation of the specifications, suggests engineers familiarize themselves with the following standards:
Overcurrent protection for LED bulbs.UL 8750 addresses protection against the risk of shock and fire.
Overcurrent protection for LED luminaires. Key standards addressing the issue of overcurrent at the luminaire include UL 1598 and UL 1993, as well as UL 1310 and UL 8750.
Overvoltage protection for LED bulbs. Energy Star standards based on IEEE C62.41.2-2002 deal directly with surge suppression at LED bulbs. Outside the US, IEC61000-4-5 is the surge immunity specification for LED lighting.
Overvoltage protection for LED luminaires. DOE standards based on IEEE C62.41.2-2002 deal with surge immunity requirements for outdoor LED lighting.
There are other certification companies out there, cheaper ones. So, for those who could care less about UL standards, how do their LED regulations fair? For those people/companies, LEDs are a non-regulated business. I worked for a company making a LED system for a hybrid car. I worked on the signaling system. Based on the job's requirements and client requests, the power system would get extremely hot. I didn't like it, they didn't care, no regulations guided anyone. There needs to be a free and open regulation for such products.
Once a non-profit testing company becomes a required standard, it's a racket.
I agree that UL may not be what we believe it to be or perhaps expect it to be. We want to believe it protects us the consumer. But I also wonder how effective they are able to do that with technology growing as fast as it does.
Yet it remains a standard that many companies require - which we see all the time. I think you are right on target with your post, Cabe. We should never become complacent and trust something just because its been around a long time. If enough folks "paused," maybe they would step up and meet the rigor they were known for in the past as a testing benchmark for consumer safety...
TomBee, I agree with you and have had similar experiences with UL over the years. I think competition from the other testing labs has contributed to their improved responsiveness. However, you are right, they are not afraid to charge their standard fees if they have the opportunity.
I have had dealings with UL going back to the mid 80's. At that time they were the only game in town for most standards. Customer service was poor and costs very high. The worst was receiving a report that a device under test had failed. Getting to the bottom of the problem identified a junior engineer un-trained in the require testing methodology and under-supervised by experienced mentors.
UL has made significant strides since those days. They are more response in some ways and more cost competitive in other areas. However, they continue to find subtle ways to overcharge in unnecessary services. Case in point is frequent plant inspections when there is no production and changes to the UL file for minor or trivial modifications which then cost far beyond the effort and time expended. I suggest you always get at least two additional test labs to quote on your requirements and then carefully evaluate the 'hidden cost' components before you sign any contracts. It is the total and ongoing maintenance cost which you need to evaluate - not just the initial test program.
Good reference article for regulation detail. The internet is the world's largest library, but all the books are on the floor. Reference pieces like this article help to install some order.
What would be the life of an LED Lamp? Eventhough it have a long life, the associated circuit for voltage/current regulation is important. The age/durability of the light depends up on the capability of these associated circuits.
Now a day's LED lighting solutions are so common in residence / business/office. But the major problems are associated with attaching electronic regulator circuits, which can cause damage to the LED. Due to this poor regulator circuits, LED lights may get faded over months and finally totally dimmed with no output.
I'm seeing where other testing certification service providers, like ETL, are gaining more ground. However, from a written standards perspective UL still has much more documentation released.
By experimenting with the photovoltaic reaction in solar cells, researchers at MIT have made a breakthrough in energy efficiency that significantly pushes the boundaries of current commercial cells on the market.
We looked at a number of sources to determine this year's greenest cars, from KBB to automotive trade magazines to environmental organizations. These 14 cars emerged as being great at either stretching fuel or reducing carbon footprint.
From Dell / Intel® New Paradigms in Design Work Scott Hamilton, vertical market strategist for Dell Precision workstations, 5/2/2013 3
Early in my career, I worked as a draftsman and remember the days of drawing on vellum with numbered pencils and Mylar with plastic lead. This was a fun experience in the sense that I ...
I've been using workstations for more than 10 years and love finding ways to get more performance from my system. With demanding professional applications that require more power each ...
A lasting memory from my first job as an engineer in an auto assembly plant is standing on hard concrete at six in the morning, vending-machine coffee clutched in hand, listening to ...
A quick look into the merger of two powerhouse 3D printing OEMs and the new leader in rapid prototyping solutions, Stratasys. The industrial revolution is now led by 3D printing and engineers are given the opportunity to fully maximize their design capabilities, reduce their time-to-market and functionally test prototypes cheaper, faster and easier. Bruce Bradshaw, Director of Marketing in North America, will explore the large product offering and variety of materials that will help CAD designers articulate their product design with actual, physical prototypes. This broadcast will dive deep into technical information including application specific stories from real world customers and their experiences with 3D printing. 3D Printing is
To save this item to your list of favorite Design News content so you can find it later in your Profile page, click the "Save It" button next to the item.
If you found this interesting or useful, please use the links to the services below to share it with other readers. You will need a free account with each service to share an item via that service.
Tweet This
3 
