With the progress of society, energy conservation, environmental protection has become an irresistible trend in the lighting field, the use of new energy-saving light, energy efficient electrical and lighting to achieve the purpose of saving energy, have been widely accepted. But how to design energy-efficient lighting to achieve the purpose of energy conservation, has just been paying attention. Dimming technology for the use of the field of energy-efficient lighting is an effective method. With its corresponding new products are constantly being developed. Sports venues in the past, cities and towns at places such as roads and tunnels large area lighting, the use of HID lighting design, from the utility, said it is not possible. Now, with advances in technology, electronic technology and the constant development of electronic components, this design has become dimmer feasible. Easy for the U.S. introduction of the three HID lights dimming technology and related products.
Dimming Electronic Ballast 
      As we all know, HID lamp electronic ballast can be easily designed dimming ballasts. Dimming principle: through a variety of sensors, input to the electronic ballast to control the frequency of the DC level job to change the operating frequency, adjust output power to the HID lamps to light the purpose. HID lamp electronic ballast dimming range: high-pressure sodium lamp output power is generally 50% to 100% (flux of about: 30% ~ 100%). Metal halide lamp output power of 60% ~ 100% (flux of about: 45% ~ 100%). According to research data, dimming electronic ballast for HID lamps, lamp start at 3 ~ 5 minutes of the job must be full power, otherwise there will be an early black tube situation, the impact of lamp life. Contrast to our preliminary experiment also proved this point. Therefore dimming electronic ballast for HID lamps should be considered in the design of the problem. Lights at startup, regardless of what status, electronic ballasts at 3 to 5 minutes should automatically work at full power output.