The U. S. Department of Energy's CALiPER test project reviewed omnidirectional and LightingFacts labeled Type a led bulbs.
The report is both encouraging and disappointing in some respects.
The test found that the variation range of type a led bulb is relatively large in terms of luminous intensity distribution, color quality, dimming and compatibility with other controls.
In third quarter of 2013 alone, more than 1700 new LED products (Not just a type LED bulb).
According to the US Department of Energy, the average luminous efficiency of all LED lamps labeled with LightingFacts introduced in third quarter of 2013 is 78 lumens/watt, which is the high average level so far.
According to reports, since it was introduced four years ago, the average luminous efficiency of all LED lamp types marked with LightingFacts has increased by an average of 9. 5% per year. 5 lumens/watt. Although the small light effect has not improved significantly (May be due to some special products)
The US Department of Energy said that the big light effect is improving at a steady rate, except for an anomalous product launched in the 2013 quarter.
At present, the overall average luminous efficiency of LED bulbs on the market is 69 lumens/watt, which is included in the range of 55 lumens/watt to 84 lumens/watt as stated by the Ministry of Energy.
It is worth noting that since September 30, 2014, energy star a lamps will be required to have a luminous efficiency greater than 55LM/W or 65 lumens/watt, depending on the input power. The US Department of Energy said most (64)
Type A bulbs below 55 lumens/watt have been deactivated.
Last year, only 5 of the 27 products were sold on the market, all less than 466 lumens.
Energy Star requires a color rendering index of not less than 80 (CRI)
And the correlation color temperature between 2700K and 6500K (CCT).
In type a bulbs, 91 of the products CRI are 80-89, the vast majority between 80 and 85.
Only 4 type a bulbs on the market have a CRI of 90 or higher.
The CCT of most Type A lamps is 2700K or 3000 K, mostly 2700 K.
At the same time, the CCT of 22 Type A bulbs on the market is as high as 4000K or higher.
The US Department of Energy pointed out that this is obviously different from the incandescent bulb that will be replaced.
It is said that there are also many bulbs in 22 with CRI below 80.
According to tests, the power factor of most LEDLightingFacts type a bulbs on the market is 0. 90 or higher.
According to DOE, many LightingFacts type a bulbs now have light distribution.
The US Department of Energy attributed it to the improvement of light efficiency, which improved the flexibility of optical applications.
Despite improvements in light distribution and light efficiency, the US Department of Energy found that only a very small number of products can effectively replace 75-watt or 100-watt Type A incandescent bulbs.
Although it is good for Type A bulbs to have an average color rendering index of 80, the US Department of Energy pointed out that this is still lower than the incandescent bulbs to be replaced.