The dust on the surface of lighting fixtures will inevitably increase if LED lighting works outside for a long time. If you don't clean up the rubbish, it will affect the brightness of the lighting. If you use LED lighting to wipe off the dust, you can use a clean cloth. (Note: no matter what kind of maintenance work, be sure to cut off all power supplies)
Next, the conservatism of LED lights requires the following:
1. Check the equipment regularly, for example, in our body, every year or a period of time in the hospital to check the body, our body is good, I want to buy a dance by myself, our LED floodlight is the same, in the process of daily maintenance, if there is any problem with the detector, it can be returned to the factory for repair in a timely manner.
2. For a long time, "from the wind of the eyes to the water" LED emits light at an angle that is necessary to be adjusted.
3. In daily inspection, if the glass on the surface of the luminescent body is found to have cracks, the luminescent body shall be removed immediately and sent back to the original factory to avoid injury.
1. Main LED dimming technology
Because the brightness of LED chip and the driving current of LED have a fixed ratio, the dimming of LED lamp is realized by adjusting the driving current of LED.
The second dimming is often referred to as analog dimming mode or linear dimming. The advantage of this dimming is to linearly increase or decrease the driving current with strong resistance compared with the control circuit of LED chip. Its disadvantage is that the change of driving current has a constant effect on the color temperature of LED chip, and also affects the color temperature of LED chip.
The third method of dimming is pulse light modulator (PWM) mode. The method can save the duration while changing the output power, and at the same time adjust the driving current square, variable pulse width and pulse width by constant control. Generally, when the frequency is from 200Hz to 10kHz, because the human eye keeps the vision, it will not make people feel the movement of light flickering. The advantage of this method is that it can improve the heat dissipation of LED. Its disadvantage is that the excessive driving current has a certain effect on the life of LED chip.
The methods of the above three dimmers are to classify the output control of LED driving current. The control circuit can also be divided into analog control and PWM control which are usually carried out by microcontroller.
2. Dimming system and future development
Perfect intelligent control should have the functions of manual control, intelligent control, optical control, time control and fault warning. When it's dark, it will automatically light up, and the lighting at 12:00 in the night will automatically reduce by half. After daybreak, the sun will automatically go out; under special circumstances, people can manually control; in case of control failure, the control system can automatically report.
The intelligent tuning system consists of four parts: central controller, single chip controller and signal detection circuit.
Server: it mainly realizes computer software and monitoring function, and mainly realizes the composition of alarm function. The site server can be set in the street lamp management control center and central controller, and connected through power line carrier, network or wireless achieved.
Central controller: a coding unit used to receive a signal from the server, transmit the signal to the controller, and transmit the result to the server while performing control and signal detection.
The signal detection circuit detects the ambient brightness, driving power supply voltage and current. Send the detected signal to the unit controller or central controller.