Hong Kong scientists are claiming an efficacy of 129lm/W from an led ‘filament’ light bulb, claiming it to be the most energy-efficient led filament technology. Researchers came from State Key Laboratory of Ultra-precision Machining Technology and the Hong Kong Polytechnic University (PolyU), working with a 2015 grant of HK$100,000 (increased to $120,000 since 2016) from the …
Read full article: Most efficient led filament lamp yet claimed