LED maker Lumileds of San Jose, CA, USA has launched the LUXEON CoB Core Range – High Density, a family of chip-on-board (CoBs) LEDs with double the luminous flux of the LUXEON CoB Core Range (Gen 3) devices.
Focusing on the most popular light-emitting surface (LES) sizes for spot lighting applications (6mm, 9mm and 11mm), the High Density CoBs can achieve what is claimed to be the highest center-beam candlepower (CBCP, or punch) in narrow-beam (<20°) spotlight applications. “Our customers require the sharpest beams and precise beam control,” says Eric Senders, product line director for LUXEON CoB LEDs. “LUXEON CoB Core Range – High Density caters to this market by delivering the highest punch at low beam angles along with exceptional quality of light,” he claims.
Light quality of LUXEON CoB Core Range – High Density products is reflected in the 3-step MacAdam Ellipse color definition. Quality of light is also associated with the color over angle (CoA) of LEDs used in spotlight applications. When the CoA is high, a ‘halo effect’ is created, where a halo or yellowish ring around the spotlight can be seen, especially against a white wall. With the LUXEON CoB Core Range – High Density array, the color differences within the beam are minimal, eliminating the halo effect, says Lumileds.
LUXEON CoB Core Range – High Density offers a maximum flux of 2500lm from a 6mm LES, 5000lm from a 9mm LES, and 6000lm from an 11mm LES (at 3000K, 80 CRI). The arrays are offered over a color temperature range of 2700-5700K and color rendering index (CRI) of 70, 80 or 90. Lumileds claims that the CoBs provide the industry’s lowest thermal resistance, enabling smaller heat-sinks and optics for lower overall system cost. The MCPCB substrate is also more robust than ceramic substrates, which are subject to cracking upon assembly or use, adds the firm.
