LED lighting devices having improved light diffusion and thermal performance

• Main Authors: DOMAGALA THOMAS W, FURLONG STEVEN C
• Format: Patent
• Language: English
• Published: 20.05.2014
• Subjects: BLASTING; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-PORTABLE LIGHTING DEVICES; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

A white light LED-based lighting device may comprise a light assembly including a plurality of white-light LEDs disposed on a substrate. The LEDs may cover the substrate top surface in a density of greater than 50 individual LEDs per square inch. An electrical driver board is electrically connected to the LEDs. A heat sink is thermally connected to the substrate and the LEDs. A reflector assembly may be disposed on the heat sink such that its focal plane is disposed generally adjacent to the LEDs. The device may have a continuous operating temperature of 65 degrees Celsius or lower in a room temperature environment. The LEDs may comprise a top surface area of less than 2 mm2 and be arranged in a series of concentric rings on the substrate with each LED oriented along the circumference thereof. The reflector assembly may be filled at least partially with an impact-resistant polymer material.