LED Illumination System with Sensor-Based Color Temperature Control
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Solution Overview
Problem
Current lighting systems in entertainment facilities, such as stadiums and concert halls, face limitations in rapidly changing lighting effects due to manual operation and the time required to start high intensity discharge fixtures, and they consume significant energy and generate heat, while also being costly to maintain for specific lighting specifications.
Innovation Solution
A lighting system utilizing LED illumination devices with multiple color temperature groups, controlled by sensors and a processor-driven system that adjusts drive currents and pulse width modulation to maintain desired color temperature and illuminance levels, allowing for automatic and efficient adjustment of lighting characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high intensity discharge fixtures are used to provide sufficient illumination, then illuminance level is improved, but start-up time increases and productivity deteriorates
Solution Approach 1:
The patent changes the operational parameters of LED fixtures by adjusting drive currents to different LED groups (warm white vs. cool white LEDs) to achieve rapid color temperature changes without the long start-up time of HID fixtures, while maintaining sufficient illuminance levels
2Adaptability or versatility
If multiple light fixtures with different color temperatures are maintained to meet specific lighting specifications, then adaptability is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes a single LED fixture universal by enabling it to produce multiple color temperatures (e.g., 4000K and 5500K) through electronic control of different LED groups, replacing the need for multiple dedicated fixtures and simplifying the overall lighting system
3Illumination intensity
If high intensity discharge fixtures operate at high power to emit sufficient light, then illuminance level is improved, but energy consumption and heat generation increase
Solution Approach 1:
The patent optimizes energy parameters by selectively activating only the necessary LED groups based on required color temperature and illuminance levels, rather than operating all fixtures at maximum power like HID systems, thereby reducing overall energy consumption
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enables rapid and energy-efficient adjustment of lighting effects while maintaining consistent illuminance and color temperature, reducing operational costs by eliminating the need for multiple light fixtures and minimizing energy consumption.
Implementation Method 1
a group of light emitting diode (LED) illumination devices, each of which includes a first group of LEDs of a first color temperature and a second group of LEDs of a second color temperature
Data Source
AI summary
A lighting system includes a group of light emitting diode (LED) illumination devices, each of which includes a device driver. One or more sensors are configured to measure a characteristic of light received from the devices in an area of an environment that is illuminated by the devices. A controller detects when a value of the measured light characteristic received by a sensor deviates from a desired value. When this happens, the controller will cause the device drivers for each of the LED illumination devices to control LEDs in each illumination device so that the desired color temperature of light will be received at the location of the sensor while maintaining a substantially constant illuminance level at the location.