Since the beginning of the 21st century, LED lamps have rapidly replaced traditional incandescent lamps and fluorescent lamps due to the advantages of energy efficiency, long lifespan and environmental benefits, and have become the new standard in the global lighting industry.As LED technology matures and costs decrease, the LED lighting industry has experienced significant growth, leading to an increasing demand for standardization. In particular, accurate assessment of the total luminous flux has become a critical task to promote standardization.At present, the usual practice of evaluating the total luminous flux of LED lamps is to compare the total luminous flux of LED lamps with incandescent lamps as the standard. The results show that with the current standards, the measurement error of LED lamps is more than 5%, while the error of incandescent lamp is only 1%. This discrepancy indicates that there is significant uncertainty in using incandescent lamps as a standard for LED measurement, and the present metrological standards cannot meet the standardization needs for LED lamps. Therefore, the development of LED standard lamp is of great significance to simplify the measurement process, reduce the error of total luminous flux measurement, and shorten the transfer chain of the measured value.Many national metrology institutes have actively participated in the research and development of LED standard lights and have made remarkable progress. In present, 2π-LED standard lamps with excellent luminosity stability have been developed in Germany, Russia, the United States, and Japan. Those results provide important support for the establishment of a photometric value transfer system based on LED standard lamps, but the total luminous flux values of the successfully developed 2π-LED standard lamps are generally small, with a maximum of only 2 000 lm. When these low-flux standard lamps are employed to calibrate high-flux LED lamps with luminous flux more than 2 000 lm (such as street lamps and square lighting lamps), it is easy to introduce nonlinear errors in the photometric measurement, resulting in higher uncertainty, which affects the reliability of the photometric value transfer system based on LED standard lamps. Thus, it is particularly important to develop high-flux 2π-LED standard lamps to enhance the measurement accuracy and standardization level of high-flux LED lamps.This study presents a novel high-flux 2π-LED standard lamp designed with 80 LED chips arranged in a concentric circular structure and encapsulated in a circular aluminum lamp panel with the diameter of 162.9 mm and the thickness of 3.0 mm, together with a Thermoelectric Cooler (TEC) for precise temperature control. The lamp has a same color temperature of 4 100 K as the L41 standard lighting and achieves a total luminous flux of 3 000 lm. The temperature field simulations with finite element analysis method were conducted to investigate the temperature distribution and evolution of the 2π-LED standard lamp, which provides an important basis for assessing its reliability with long-term operation. The changes in surface temperatures of the LED chips and the aluminum lamp panel over time are studied experimentally, as well as variations in the total luminous flux, the instability, and the non-repeatability with respect to operating time. The adaptability of 2π-LED standard lamp to TEC cooling temperature and ambient temperature, and the uniformity of spatial luminous intensity are also analyzed. The experimental results show that the technical requirements of the 2π-LED standard lamp are superior to the incandescent standard lamp specified in the ″Standard Method for Total Luminous Flux Measurement of Incandescent Lamps″ (JJG 247-2008) in terms of the ambient temperature adaptability, the luminosity stability, the repeatability, and the luminous uniformity. Within the temperature range of 20 ℃ to 30 ℃, the 2π-LED standard lamp exhibited excellent adaptability to TEC cooling and ambient temperatures, with the temperature coefficients are about 0.10%/°C and 0.01%/℃, respectively. Under conditions of the TEC cooling temperature is 27 ℃ and the ambient temperature is 25 ℃, the preheating time is 150 seconds, and the total luminous flux reaches 3 008 lm. Within 8 h, the photometric instability is only 0.046%.The repeatable and the maximum deviation of the luminous intensity are only 0.048% and 1.9%, respectively, with the color space uniformity is 0.001 2. The research results have significant practical implications for enhancing the photometric parameters of high-power 2π-LED lights, and can provide new insights and foundations for the development of LED lighting technology and the establishment of relevant standards.