News

20 August 2009

 

Lumileds LUXEON Rebel hot /cold factor improves SSL efficiency and simplifies thermal design

LED maker Philips Lumileds of San Jose, CA, USA says that continued advances in its core LED chip and packaging technology have led to recent breakthroughs, implemented in its latest LUXEON Rebel LEDs for illumination applications, that improve luminous efficacy and light output performance at luminaire operating temperatures.

Hot/cold factor compares the light output of the LED at junction temperatures (Tj) of 100°C and 25°C (which is how LEDs are specified on a datasheet). LEDs in a luminaire are operated at very high junction temperatures, often between 80°C and 110°C. As the temperature increases, light output and efficacy decrease. With a hot/cold factor of 0.93, the just-released LUXEON Rebel LEDs deliver more light and better efficacy than virtually any other power LED, the firm claims. Typical hot/cold factors range from 0.80 to 0.85 at junction temperatures of 100°C. Maximizing this factor is critical as companies design solid-state lighting solutions that are intended to meet ENERGY STAR requirements, Lumileds adds.

“Hot/cold factor is one of the clear differentiators between LEDs,” says Rudi Hechfellner, director of Technical Solutions. “A high HC factor can simplify the thermal system design and lower the cost per lumen in the final application.”

Hot/cold factor charts for all LUXEON Rebel LEDs are available from the datasheets.

See related items:

Lumileds launches first LUXEON Rebel LEDs for illumination applications

Lumileds launches LUXEON Rebel phosphor converted amber LED

Search: Philips Lumileds LUXEON Rebel LEDs

Visit: www.philipslumileds.com