As a new type of road lighting product, led modular str […]
As a new type of road lighting product, led modular street light has the characteristics of high efficiency, energy saving, stability and reliability. The luminous efficiency is several times higher than that of the high pressure sodium lamp used in traditional road lighting. The lamp has a long life, low power consumption and light decay. The situation is relatively small. After one year, the brightness is still unchanged, and it can save more than 60% energy than ordinary street lights. It is an ideal lighting choice. Do you know what design requirements it has?
In the market, common LED modular street lamp power supplies use constant current power supplies, which are determined by the characteristics of LED lighting materials. These materials are greatly affected by the environment. Long-term operation exceeding the rated current will greatly shorten the life of the lamp beads. The constant current power supply can play a role in ensuring the stability of the current. The design of led modular street lights has the following requirements: The major feature of lighting LEDs is that they have the function of directional light emission, because almost all power LEDs are equipped with reflectors, and the efficiency of such reflectors is significantly higher than that of lamps. efficient. In addition, the efficiency of the self-reflector has been included in the detection of the light efficiency of the LED. Road luminaires using LEDs should use the directional emission characteristics of LEDs as much as possible, so that each LED in the road luminaires directly emit light to each area of the illuminated road, and then use the auxiliary light distribution of the luminaire reflector to achieve Very reasonable comprehensive light distribution of road lamps.
It should be said that road lamps must truly meet the illuminance and uniformity requirements of CJJ45-2006 and CIE31 and CIE115 standards, and the three-time light distribution function in the luminaire can be better realized. The LED with a reflector and a reasonable beam output angle itself has a good primary light distribution function. In the luminaire, the installation position and emission direction of each LED can be designed according to the height of the road luminaire and the width of the road surface to achieve a good secondary light distribution function. The reflector in this kind of lamps is only used as an auxiliary three-time light distribution method to ensure a better uniformity of road illumination.
The power system of led modular street lights is also different from traditional light sources. The constant current drive power required by LEDs is a cornerstone to ensure its normal operation. Simple switching power supply solutions often bring damage to LED devices. How to make a group of LEDs that are tightly compressed is safe is also an indicator for investigating LED modular street lights. The requirement of the LED on the drive circuit is to ensure the characteristics of constant current output. Because the junction voltage is relatively small when the LED is working in the forward direction, the constant LED drive current is guaranteed to basically ensure the constant output power of the LED. For the current situation of unstable power supply voltage in our country, it is very necessary for the driving circuit of the road lamp LED to have a constant current output characteristic, which can ensure the constant light output and prevent the overpower operation of the LED.