Benefits of AC LEDs mainly relate to the reduction/elimination of associated electronics. Components removed can include a voltage regular, power transformer, diode rectifier and filter. The benefit of removing these components is that cost, lifetime and reliability are improved while the more compact size is also beneficial.


IMS research: excellence in market intelligneceReflecting on the recent lighting show in Frankfurt, it was of interest to see several companies promoting AC LEDs which plug directly into the mains. Seoul Semi, with their Acriche range, has for some while now been the main company promoting this technology, and they have done so heavily. For instance, many of their employees have used (at) email addresses for some time now. Until this show, I didn’t realise that other companies have been developing this technology as well. Both Everlight and Philips Lumileds displayed new products at the show which are due for release in the coming months, and I also heard mention of Forward Electronics, another company that has this technology. Liquid LEDs, also from Taiwan, also have AC LEDs for retrofits so there are now at least five companies promoting it.

Benefits of AC LEDs mainly relate to the reduction/elimination of associated electronics. Components removed can include a voltage regular, power transformer, diode rectifier and filter (of course, this is not an advantage if you are a manufacturer of LED driver ICs or integrated lighting control ICs, which include several of these functions). The benefit of removing these components is that cost, lifetime and reliability are improved while the more compact size is also beneficial.

The main disadvantage is the significantly reduced efficiency, perhaps about 30% less brightness for the same power according to an industry source, which is very significant (i.e. a typical current value of 60L/W compared to 90L/W for DC). AC LED saves on efficiency by avoiding driver losses, but these are typically less (maybe 10-15%). AC LEDs are likely to do well where space is more of a concern than maximising brightness however it is as yet unclear how big the overall market for these products will become in the future.

Industry sources explain that the technology for the AC LEDs in at least some of these companies involves chips that in simple terms are effectively composed of many tiny sections. The flickering between states reduces the chip utility rate and is what causes the reduced efficiency. Some of the companies mentioned above use an Epistar patent developed in conjuction with ITRI. IMS Research has found out that the products from different companies use primarily similar technology but with some differences.

AC LEDs have not been quantified in IMS Research reports but we should do so in the future.

No comments
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2015 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
Your leaks start here: Take a disciplined approach with your hydraulic system; U.S. presence at Hannover Messe a rousing success
Hannover Messe 2016: Taking hold of the future - Partner Country status spotlights U.S. manufacturing; Honoring manufacturing excellence: The 2015 Product of the Year Winners
Inside IIoT: How technology, strategy can improve your operation; Dry media or web scrubber?; Six steps to design a PM program
Getting to the bottom of subsea repairs: Older pipelines need more attention, and operators need a repair strategy; OTC preview; Offshore production difficult - and crucial
Digital oilfields: Integrated HMI/SCADA systems enable smarter data acquisition; Real-world impact of simulation; Electric actuator technology prospers in production fields
Special report: U.S. natural gas; LNG transport technologies evolve to meet market demand; Understanding new methane regulations; Predictive maintenance for gas pipeline compressors
Warehouse winter comfort: The HTHV solution; Cooling with natural gas; Plastics industry booming
Managing automation upgrades, retrofits; Making technical, business sense; Ensuring network cyber security
Designing generator systems; Using online commissioning tools; Selective coordination best practices

Annual Salary Survey

Before the calendar turned, 2016 already had the makings of a pivotal year for manufacturing, and for the world.

There were the big events for the year, including the United States as Partner Country at Hannover Messe in April and the 2016 International Manufacturing Technology Show in Chicago in September. There's also the matter of the U.S. presidential elections in November, which promise to shape policy in manufacturing for years to come.

But the year started with global economic turmoil, as a slowdown in Chinese manufacturing triggered a worldwide stock hiccup that sent values plummeting. The continued plunge in world oil prices has resulted in a slowdown in exploration and, by extension, the manufacture of exploration equipment.

Read more: 2015 Salary Survey

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.
This article collection contains several articles on the vital role that compressed air plays in manufacturing plants.
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.
This article collection contains several articles on strategic maintenance and understanding all the parts of your plant.
click me