ABOUT
Shanghai longjoin Intelligent Technology Co., Ltd. (Stock Code: 837588), with a registered capital of 4 million USD, was established in 2003. We are a 20-year-old enterprise specializing in the field of lighting control. We are primarily engaged in the development, production, and sales of intelligent streetlights, road, and area lighting fixtures controllers. We are dedicated to providing cutting-edge technical support for smart cities, public streetlight systems, and various types of area lighting fixtures. Our product range includes standard sensor switches for outdoor and indoor lighting fixtures, special interfaces for outdoor LED lighting intelligent controllers, adaptive dimming controllers for fixtures, energy-saving optimization intelligent controllers, local communication intelligent controllers, and wide-area communication intelligent controllers.Products & Services: Our core products are divided into two major series: standard and intelligent. Specifically, they cover standard fixture sensor switch series, LED streetlight intelligent controller interface series, and standardized LED streetlight intelligent controller series. These products not only possess efficient and stable control functions but also achieve automated management and optimized control of fixtures through intelligent technology, thereby helping customers achieve energy savings, reduce consumption, and enhance the intelligence level of public lighting systems.Market Positioning: Our products primarily serve North American streetlight manufacturers, as well as electrical light source fixture manufacturers for public utilities, commercial use, residential use, and large home product shopping platforms. With our outstanding product quality and innovative solutions, we have earned the trust of numerous renowned customers such as Cree LED Lighting, NSI Industries, and Signify.Functions & Vision: Our products aim to provide customers with control equipment featuring safety and unattended functions, enabling unmanned and automated lighting management of fixtures. Through intelligent operational control, we help customers reduce energy consumption, improve operational efficiency, and simultaneously facilitate the expansion of intelligent streetlight networks, contributing to the construction of smart city data application infrastructure.Future Outlook: Looking ahead, we will continue to uphold the concept of technological innovation, continuously enhance product performance and service quality, and provide customers with even more superior solutions. We believe that through our efforts, we will contribute significantly to the development of smart cities and the public lighting sector.https://www.ljlightctrls.com/
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Tel: +86-21-56666351
E-mail: xy@longjoin.com
Address:
2nd Floor, Building 8, 129 Hulan West Road, Baoshan District, Shanghai, China

What Is a Street Light Photocell?
What Is a Street Light Photocell?
Street lighting controllers are devices used to control the brightness and switches of street lights. By automatically sensing and adjusting the brightness of street lights, they aim to save energy and extend the lifespan of street lighting.
Street lighting controllers typically consist of sensors, controllers, and actuators. The sensor is used to detect the brightness and motion in the surrounding environment, the controller controls the brightness and switches of the street lighting based on the signals from the sensor, and the actuator is responsible for the actual control of the brightness and switching operations of the street lighting.
The working principle of the longjoin street light controller is based on photoresistors or photodiodes and other photosensitive components. When the surrounding environment darkens, the photosensitive component detects the decrease in light and sends a signal to the controller, which adjusts the brightness of the street lighting based on the signal. When the surrounding environment brightens, the photosensitive component detects the increase in light, and the controller reduces the brightness of the street lighting or turns it off.
The main functions of the street lighting controller are to save energy and extend the lifespan of street lighting. By automatically adjusting the brightness of street lighting based on the ambient brightness, it avoids wasting energy during the day or when there is sufficient light. Additionally, the street lighting controller can also adjust the brightness based on road conditions and traffic situations, improving the safety of nighttime driving.
In addition to saving energy and extending lifespan, the street lighting controller has several other advantages. Firstly, it can reduce the cost of manual management and maintenance. Traditional street lighting requires manual adjustment of brightness and switches based on weather and time, but the street lighting controller can automatically complete these tasks, reducing the wastage of human resources. Secondly, the street lighting controller can adjust the brightness as needed, enhancing the flexibility and adaptability of street lighting. For example, the brightness can be increased in busy traffic sections while reduced in less busy areas to achieve the goals of saving energy and enhancing safety.
In summary, the street lighting controller is a device used to control the brightness and switches of street lighting. By automatically sensing and adjusting the brightness of street lights, it aims to save energy and extend the lifespan of street lighting. It has advantages such as energy-saving, lifespan extension, reduced management costs, and enhanced flexibility, which are of great significance for urban lighting management.
We can also offer kinds of light socket for sale, anything you need, please contact us.

Smart & Auto Street Lighting Controller
Shanghai LongJoin Intelligence Co., Ltd. Established in September 2003 in Shanghai’s Baoshan District as one of the street light controller manufacturers, the company focuses on the design, development, and manufacturing of light-controlled switching devices. With over 20 years of expertise in optical controller manufacturing, specializes in street lighting photocells, street lighting receptacles, photocell caps, photocontrol covers, and photocontrol bases.
Smart & Auto Street light Controller
Wide Compatibility
Easily compatible with other brands of smart & automatic street light on off controllers, offering street light controller bases with NEMA standard interfaces and Zhaga Book 18 standard interfaces, including reliable photocell base options for seamless integration.
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Production Stability
Standardized production processes ensure reliable product quality. Street light controller manufacturers benefit from these standardized processes, ensuring that each street light automatic switch and smart street light controller they produce meets high-quality standards for optimal performance, complete with durable photocell cap designs.
02
Technological Innovation
Strong independent research and development capabilities, continuously introducing innovative automatic street light control products, such as advanced street light photo cell sensors for enhanced dusk-to-dawn functionality.
03
How to Choose the Best Automatic & Smart Street Light Controller?
Compatibility: Ensure that the street light automatic switch is compatible with your existing lighting system or equipment, including protective photocell cover elements to shield sensitive components.
Functional requirements: Select a intelligent street light controller with suitable functions based on actual needs, such as timing control, light sensing, etc.
Quality and reliability: Choose a reputable brand to ensure the quality and reliability of the automatic street light on off controller.
Price and value: Consider the longjoin street light controller price and its performance to choose a product with high value for money.
Interface standards: Choose a base interface that meets local standards, such as NEMA or Zhaga Book 18, based on the country of product export to ensure smooth installation and use.
Engineering considerations: For retrofit projects, it is recommended to choose an external street light controller for easy installation and integration with the existing system. For new construction projects, it is recommended to choose an embedded light controller for a more aesthetically pleasing and secure installation.
We can also offer kinds of light bulb socket for sale, anything you need, please contact us.

JL-208 NEMA Interface Twist Lock Photocell Shorting Cap
For 3P/5P/7P Twist Lock Photocell Receptacle Temporary Protection, Provide Power Connection
JL-208 NEMA Interface Twist Lock Photocell Shorting Cap Features:
Use a twist lock shorting cap to temporarily bypass a twist-lock photocontrol receptacle during maintenance.
Applicable with both ANSI C136.10 & C136.41
IP66 protection while installed
UV stabilized Polycarbonate enclosure
High impact Polybutylene Terephthalate base
Easy-to-handle Twist-bar Enclosure
JL-208 NEMA Interface Twist Lock Photocell Shorting Cap Overview:
Shorting caps, such as the JL 208 shorting cap, are commonly used to safeguard NEMA twist-lock sockets on outdoor lighting fixtures before the setup of independent or networked lighting controls. The NEMA shorting cap also facilitates maintenance marking and ensures continuous lighting for safety. The JL-208 shorting cap from street light controller supplier LongJoin provides a convenient and economical temporary circuit connection solution as a twist lock photocell shorting cap. It can be equipped with varistors to protect LED fixtures from transient voltage surges, functioning effectively as a photocell bypass cap to maintain power continuity. With compatibility for 3P, 5P, and 7 pin shorting cap configurations, it achieves an IP66 protection rating post-installation. The black casing improves visual differentiation from open circuit caps, aiding in quick identification.
JL-208 NEMA Interface Twist Lock Photocell Shorting Cap Installation
Disconnect power; wire the receptacle according to the diagram below. Push the street light shorting cap on and twist it clockwise to lock it into the receptacle.
JL-208 NEMA Interface Twist Lock Photocell Shorting Cap Installation Video
If you want to buy a longjoin street light controller, please contact us.