Seoul Semiconductor announces high-voltage LED for street lights

The 64V MJT 4040 uses what Seoul calls Multi Junction Technology and relies on a small AC-driver IC to eliminate the AC/DC driver typically utilized in SSL street lights.

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Seoul Semiconductor has announced the MJT 4040 packaged LED that targets outdoor solid-state lighting (SSL) applications such as street lights. The multi-emitter LED features a 64V forward voltage and is intended to extend Seoul's Acrich family of LEDs into high-power applications.

While Seoul is perhaps best known for AC-LED technology, the MJT4040 is apparently just a high-voltage, multi-emitted LED that can be paired with Seoul's Acrich AC-drive technology. Seoul calls the LED architecture Multi Junction Technology.

Seoul Mjt4040
The MJT 4040 needs only an IC as a driver

Driven at 64V and 20 mA, the MJT 4040 delivers 200 lm at a 5000K CCT, and delivers efficacy of 140 lm/W. Seoul will offers the LED over a range of 4200K to 6000K, all with a CRI of 70. By doubling the drive current you can realize flux output around 360 lm.

In the intended street light application, Seoul proposes paring the MJT 4040 LEDs with an Acrich driver IC that operates directly from the AC line. As the nearby photo illustrates, Seoul compares the 6×6-mm IC that is mounted directly on the LED light engine to the driver required in DC applications that Seoul says weights 2-3kg. The company also said that the AC-drive implementation eliminates the need for an electrolytic capacitor – both reducing cost and increasing reliability.

Seoul said that it had already won a major street-light, retrofit project in China with the new LEDs. "It [the MJT 4040] is perfect for not only streetlights but parking lot lights, security lights, low-bays, high-bays and many other outdoor lighting fixtures," said Marten Williams, the global marketing VP at Seoul Semiconductor. "We are currently supplying this product to streetlight manufacturers in China, South America and other developing countries."

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