Choice of solar lamp light source

At present, most lawn lights use LED as a light source, LED long life, can reach more than 100,000 hours, low working voltage, very suitable for application in solar lawn lights. In particular, LED technology has achieved its key breakthroughs, and its characteristics have been greatly improved in the past five years. At the same time, the price-performance ratio has also been greatly improved. In addition, the LED is powered by low-voltage DC, its light source control cost is low, the adjustment of light and dark, frequent switching is possible, and will not have an adverse effect on the performance of the LED.

It is possible to control the color, change the distribution of light, and produce dynamic illusions, so it is particularly suitable for application in solar lawn lights. There are many inherent characteristics, if not paid attention to when using it will cause adverse consequences. However, the luminous efficiency of LED currently sold on the market can only reach 15Lm/W, which can only reach 1/3 of the three-color primary color high-efficiency energy-saving lamp, and the luminous efficiency of the three-color primary color high-efficiency energy-saving lamp can reach 50 Lm/W ~60Lm/W.

From the price point of view, the current production cost per Lm: three-color primary color efficient energy-saving lamp (including electronic ballast) 0.022 yuan, 2002 f5mm white LED price is 1.9~3.0 yuan, the current production cost per Lm is high, the price difference is wide. From the service life point of view, the life of three-color primary color high-efficiency energy-saving lamp (including electronic ballast) can reach 6000 hours, LED can reach more than 100000 hours, from the surface, LED life is three-color primary color high-efficiency energy-saving lamp (including electronic ballast) dozens of times, but this is not the case.

At present, most of the solar lawn lights use ultra-bright white LED, it is under 20mA ultra-bright white LED light pass maintenance rate to reach the initial intensity of 50% of the time (life) is less than 10,000 hours, Fudan University electric light source Institute has proved the above argument.

That is to say, LED is not the best solar lawn light source in many cases, unless it is a low-grade, solar lawn light with a service life of only 1 to 2 years, or a solar lawn light below 1w. For more than 1W solar lawn lights, it is best to use three-color primary color high-efficiency energy-saving lamps. At present, there are some solar lawn lights with 30 to 40 ultra-bright white leds, the input power is more than 2W, in this case, if the use of three-color primary efficient energy-saving lamps, the price is only 1/10 of the LED, the luminous flux is 4 times the original, and now has successfully developed 2~10W low-voltage DC three-color primary efficient energy-saving lamps, The life span can reach 6000 hours.

Based on the above analysis, we believe that low-power solar lawn lights below 1W that have the function of adjusting light and shade and frequent switching should generally use LED as a light source. However, in the use of ultra-bright white LED, special attention should be paid to the maintenance rate of light, otherwise it is easy to cause accidents. For solar lawn lights with large power, the current use of three-color primary color high-efficiency energy-saving lamps is more reasonable. It should be emphasized here that the above conclusions are only the current analysis, when the LED technology level increases, the price drops, the above conclusions need to change.

For solar garden lights, from the reliability, performance-price ratio, color temperature, and luminous efficiency of several aspects of comprehensive consideration, we believe that the ideal light source should be three-color primary color high-efficiency energy-saving lamps.