# HCL Control Strategy for an Adaptive Roadway Lighting Distribution
###### Abstract  
This study aims to develop a human-centric, intelligent lighting control system using adaptive LED lights in roadway lighting, integrated with an imaging luminance meter that uses an IoT sensor driver to detect the brightness of road surfaces. AI image data are collected for luminance and vehicle conditions analyses to adjust the output of the photometric curve. Type-A lenses are designed for R3 dry roads, while Type-B lenses are designed for W1 wet roads, to solve hazards caused by slippery roads, for optimizing safety and for visual clarity for road users. Data are collected for establishing formulae to optimize road lighting. First, the research uses zonal flux analysis to design secondary optical components of LED roadway lighting. Based on the distribution of LED lights and the target photometric curve, the freeform surface calculation model and formula are established, and control points of each curved surface are calculated using an iterative method. The reflection coefficient of a roadway is used to design optical lenses that take into account the illuminance and luminance uniformity to produce photometric curves accordingly. This system monitors roadway luminance in real time, which simulates drivers' visual experiences and uses the ZigBee protocol to transmit control commands. This optimizes the output of light according to weather and produces quality roadway lighting, providing a safer driving environment. h 25 October 2021  
HCL Control Strategy for an Adaptive Roadway Lighting Distribution  
[PERSON], [PERSON], [PERSON], [PERSON], [PERSON], [PERSON], [PERSON] HCL Control Strategy for an Adaptive Roadway Lighting  
Submitted to: 17 September 2021  
Accepted: 18 October 2021  
Submitted to: 17 September 2021  
Submitted to: 18 October 2021  
secondary optical components to provide appropriate lighting for all kinds of places, so as to meet the expectations and needs of road users. When it comes to LED secondary optical design, there are some important factors that should be taken into consideration in the current LED optical industry, such as manufacturing materials, production techniques, beam pattern application, freeform surface calculation and efficiency evaluation, etc. These factors will directly affect the quality of lighting and only by fully considering the correlation between various indicators, and making a comprehensive evaluation of the whole system, can a lighting design be thoroughly planned out. There are many types of LEDs on the market at the present time, and different package forms of light sources display their beam pattern differently [5]. Although the light-emitting area of most LED lights are smaller than traditional light, it cannot be regarded as a real dot lighting source. The recent literature has proposed a few lighting uniformity designs for the LED light source [6; 7], however, they often assume that LEDs are an ideal light source, which causes further constraints when designing. Currently, there are some studies on LED secondary optical design that proposes that the design process be conformed to its application requirements and needs. The most extensive research, which is still in the early stage of its development, is the design of the total internal reflection lens [8; 9; 10; 11]. Based on the physical characteristics of the total internal reflection principle, components of the curved surface are designed to change the LED's light-emitting angle. There are diverse research directions on the application of freeform surfaces regarding LED secondary optics, and there are many discussions on the establishment of formulas and methods of evaluation [12; 13; 14; 15]. The research includes collimating lens design [16; 17], which defines the basic general formula for freeform surface design. Under ideal light sources, perfect collimated light can be output, as well as a narrow-angle beam pattern in practice.