where thermal management is a challenge

The 5mm and 3mm LEDs are targeted towards traffic signaling, transportation and direct view signage applications, including the LED billboards frequently appearing on buildings and along roadways. For these types of exterior applications, AlInGaP-based LEDs have proven to be a challenge for the industry as their performance fluctuates with temperature. When used in exterior advertising-type applications, for example, traditional amber LEDs tend to dim as the day gets warmer and brighten as the led high bay light, which is a problem. LED-based signs and traffic indicators should do exactly the opposite, which is to brighten in the daytime and dim at night to maintain balance with the ambient light in order to enhance visibility and maintain public safety.

They have been able to overcome key challenges that have plagued designers who use traditional AlInGaP amber devices. The blue-excited amber phosphor solution allows their to offer tight color and luminosity bins with very substantial increases in the overall efficacy. With a 56 lumen typical output, their 1-watt amber LEDs are demonstrating 70% more efficiency than AlInGaP amber chips operating in nominal environments.

In higher heat environments or where thermal management is a challenge, the blue-excited amber LED line maintains a lumen-level more comparable to high-output blue LEDs. In those more rigorous environments,led flood light can experience performance degradations of up to 50% of their initial intensities, suggesting more than a 2.5 times increase in efficiency from the selection of Intematix' blue-excited amber line. These performance benefits extend across Intematix' complete amber-color LED line.