Unlike conventional street lights, LED road lighting luminaires utilize a low-voltage DC power supply. These unique advantages offer high efficiency, safety, energy savings, environmental friendliness, a long lifespan, fast response times, and a high color rendering index, making them suitable for widespread road use.
LED road lighting luminaire design has the following requirements:
The most significant feature of LED lighting is its directional light emission. Power LEDs are almost always equipped with reflectors, and the efficiency of these reflectors is significantly higher than that of the lamp’s own reflector. Furthermore, LED light efficiency testing includes the efficiency of its own reflector. LED road lighting luminaires should maximize their directional light emission, ensuring that each LED in the fixture directly directs light to each area of the illuminated road surface. The fixture’s reflector then provides supplementary light distribution to achieve optimal overall light distribution. In other words, for street lights to truly meet the illumination and uniformity requirements of CJJ45-2006, CIE31, and CIE115 standards, they must incorporate a three-stage light distribution system. LEDs with reflectors and optimized beam output angles inherently offer excellent primary light distribution. Within a luminaire, optimizing the mounting position and light emission direction of each LED based on the fixture’s height and road width allows for excellent secondary light distribution. The reflector in this type of luminaire serves only as a supplementary tertiary light distribution tool, ensuring more uniform illumination along the road.
In actual street lighting fixture design, a basic design for each LED’s emission direction can be established, with each LED secured to the fixture using a ball joint. When the fixture is used at different heights and beam widths, the ball joint can be adjusted to achieve the desired beam direction for each LED.
The power supply system for LED road lighting luminaires also differs from that of traditional light sources. LEDs require a unique constant current driver, which is essential for proper operation. Simple switching power supply solutions often damage the LED components. Ensuring the safety of tightly packed LEDs is also a key evaluation criterion for LED road lighting luminaires. LED driver circuits require constant current output. Because the junction voltage of LEDs varies very little during forward operation, maintaining a constant LED drive current essentially guarantees constant output power.
For an LED driver circuit to exhibit constant current characteristics, its output internal impedance, viewed from the driver’s output end, must be high. During operation, the load current also flows through this output internal impedance. If the driver circuit consists of a step-down, rectifier-filtered, and then a DC constant current source circuit, or a general-purpose switching power supply plus a resistor circuit, significant active power will be consumed. Therefore, while these two types of driver circuits essentially meet the requirement for constant current output, their efficiency cannot be high. The correct design solution is to use an active electronic switching circuit or a high-frequency current to drive the LED. These two approaches can ensure that the driver circuit maintains good constant current output characteristics while still maintaining high conversion efficiency.
From R&D and design to finished product delivery, TIANXIANG LED road lighting luminaires ensure light efficiency, illumination, uniformity and safety performance throughout the entire chain, accurately matching the lighting needs of various scenarios such as urban roads, community streets, and industrial parks, providing reliable support for night travel safety and environmental lighting.
Post time: Sep-30-2025