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The above is the DOE's just-concluded forecast for the 2009-2014 Five-Year Plan for Solid State Lighting, which indicates that the attention of manufacturers will soon be removed from efficiency. Fred W el sh from Radcliffe Advisors is involved in the preparation of this report. He said: "There are a lot of things to be solved, and now we have raised the efficiency to an expected height."
This report was compiled by DOE and brought together a large number of LED Lighting efficiency results from the US SSL companies (including Philips' Lumi leds division, OSRAM US division and Cree). The data exceeded the expected value. For example, in September last year Cree released a 129lm/W cool white LED (color temperature 5813K), but the report also improved some of the lower efficiency white light standard, that is, the standard value of luminous efficiency when the color temperature is 2950K Increased to 99lm/W.
The above picture is taken from the DOE report, which identifies the goal of efficiency: the red dashed line represents the upper limit of the luminous efficacy of the cool white LED efficiency, and the yellow dotted line is the maximum of the warm white light. Welsh said: "The luminous efficiency of the lab's cool white light (marked with dots) has indeed increased exponentially. We have had a lot of discussion before whether it will continue.
In addition, I think we should have more things to solve, such as the quality of light, and now it has become a crucial factor in bringing products to market. We like to see that there are some high-efficiency products appearing on the market; now people also emphasize that the market needs warm white LEDs such as indoor home lighting, which is a difficult application area for cold white light. †
LEDs will transition to warmer white LEDs and more efficient lighting. In the next two years, the ongoing luminous efficiency competition of the two top manufacturers will be eased because they will adjust their strategies and return to the mission of expanding their business scope.