US and Chinese patent offices grant IST Ltd's LED downlight patent

Integrated System Technologies (IST) Limited, a leading British manufacturer of smart lighting solutions, announced that the United States Patent and Trademark Office and the Chinese Patent Office have granted patents covering high efficiency LED luminaires for downlight applications. US Patent 8,664,882 and Chinese Patent ZL200980139063, “Collimated Illumination System Using an Extended Apparent Source Size to Provide a High Quality and Efficient Fixture”, describe a downlight illumination system that maintains a high light output ratio greater than 0.75, with an extended apparent source size to provide a near uniform illuminance, correlated colour temperature (CCT) and colour rendering index (CRI) distribution across an illuminated area.