In the case of electricity, of course, the best AC-DC direct constant current output of the program.
This program can only provide a small power output (<40W) only the United States Power Integration company TOP250YN can provide 75W power output of the program. The circuit is very complicated, expensive, and low flexibility, which is not popular in mains led lighting applications.
LED street lamps direct constant current output power supply, but usually only a single output. If you want to multi-channel must be customized (large ones, and each current). On the one hand increases the cost, and will have any change would be very troublesome.
So in the case of electricity, the best first constant voltage power supply regulator and then using the constant current of multiple constant current module. The greatest advantage that we can get the highest efficiency in a variety of LED street lamps connection structure. Can choose the output voltage of the constant voltage source to achieve the best match. And high flexibility, it is easy to change their combination.
As a light source, the dimming is very important. Not only in order to get a more comfortable environment in the home, today, to reduce unnecessary electric light, in order to further the purpose of energy saving is more important. For the led high bay light source dimmer than other fluorescent lamps, energy saving lamps, high pressure sodium and other easy to implement, so it should be in all types of LED street lamps with dimming function.