Improve the design of medium power LED lighting
In today's retrofit lighting market, cost is one of the most powerful boosters. Why medium-power LED lighting manufacturers focus on helping designers simplify designs and reduce the total bill of materials (BOM) for a number of reasons, and cost is one of them. Many of the latest improvements focus on achieving maximum energy efficiency and light quality in a minimal package. Sometimes, LED manufacturers offer high-voltage versions that help save space by reducing the number and cost of LEDs by integrating two LED chips in a single package, or by providing different chip surfaces, allowing designers to choose the right LED for their application.
Engineers are always looking for ways to simplify product design while reducing overall system cost. Some of the latest mid-power LED designs from Philips Lumileds, OSRAM Opto Semiconductors and SAMSUNG Electronics are specifically tailored to this requirement.
Philips Lumileds' LUXEON 3535 2D is one of the latest innovations in medium power LED technology (Figure 1). This LED is used to produce 4000 K of cool white light with an energy efficiency of up to 140 lumens per watt (lm/W) and a minimum color rendering index (CRI) of 80. It also reduces the number of LEDs required to retrofit lamps by 50%. The device integrates dual-chip in a single package, reducing the design cost of retrofit lamps, consumer spotlights, and industrial diffuser lamps. This means that if you design a 50 W PAR lamp, you only need four LEDs, and if it is 40 W A19, you only need six LEDs. According to the company, these two designs previously required up to 14 LEDs.
The medium power LUXEON 3535 2D LED covers all correlated color temperature (CCT) spectra from 2700K to 6500K with a minimum CRI of 80. These mid-power LEDs are available in a 3535 form factor with a working power of 0.5 W to 1 W and a brightness of 130 lumens. It is rated at 100 mA and has a maximum drive current of 200 mA. These LEDs meet ENERGY STAR requirements for 25,000 hours of operation at 85°C and 150 mA.
Philips Lumileds has also developed a high-voltage, medium-power version that helps simplify luminaire design. The LUXEON 3535 HV high voltage LED (Figure 2) has two key advantages: high brightness and compatible high voltage drivers. These advantages reduce the system BOM of the fixture or bulb.
Lighting manufacturers can design LUXEON 3535 HV LEDs into smaller, high-voltage drivers, simplifying overall lighting solution design and reducing their total cost. The high voltage medium power product portfolio includes 24 V and 48 V parts.
According to Philips Lumileds, the main advantage of using high-voltage LEDs is that their drives have fewer than 20 components and up to 50 standard LED drivers. This reduces the total BOM cost and reduces the number of component stocks required.
The LUXEON 3535 HV 48 V version has a typical lumen output of 120 lm at 20 mA and 125 lm/W at 4000K color temperature and 80 CRI. At 20 mA, the 24 V LED has an output lumen of 60 lm and an energy efficiency of 125 lm/W at 4000K color temperature and 80 CRI. These LEDs feature a 1/9 micro-color binning structure with 3rd and 5th order color accuracy for tight color control. The company offers LM-80 data for 24 V and 48 V devices. Applications for the LUXEON 3535 HV include luminaires with limited space, such as retrofit lamps, spotlights, wall lights, wall hanging lamps, and chandeliers. These products are interchangeable with other 3535 devices.
In summary, in order to make LEDs more popular in lighting fixtures and luminaires, LED manufacturers are developing medium-power LEDs with more energy-efficient, more advanced features and more options to help improve cost structure. These improvements mean lowering costs by providing a simpler design, a better manufacturing process, and a smaller bill of materials.