LED Lighting Sheet Layout for Uniform Growth Light Distribution
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Solution Overview
Problem
Existing LED lighting systems for plant and animal growth suffer from variations in photosynthetic photon flux density, leading to uneven growth rates and increased defects like tip burn, as plants or animals closer to the light sources receive excessive light while those farther away receive insufficient light, resulting in reduced yields and nonconforming products.
Innovation Solution
An LED lighting sheet with an array of LED chips arranged in series and parallel on a flexible substrate, covered with a transparent protective film, ensuring a photosynthetic photon flux density of at least 0.2 and a standard deviation of no more than 0.5 at 50 mm away, reducing light variations and enhancing growth uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a plurality of straight-tube plant growth lights using LEDs is arranged in shelves, then low-power consumption lighting is achieved, but variations in photosynthetic photon flux density occur leading to uneven growth rates
Solution Approach 1:
The lighting system is segmented into multiple LED chips arranged in a matrix pattern on a flat board, replacing the conventional straight-tube arrangement. This segmentation allows for more uniform light distribution across the growth area, reducing variations in photosynthetic photon flux density while maintaining low power consumption.
Solution Approach 2:
The patent applies local quality by positioning LED chips at specific intervals and orientations on the board surface, creating zones of optimized light emission. This local arrangement ensures that each area of the growth space receives appropriate light intensity, eliminating the uneven growth patterns caused by concentrated straight-tube lighting.
2Illumination intensity
If LED chips are arranged to increase light output, then photosynthetic photon flux density increases, but variations in light distribution increase leading to tip burn and defects
Solution Approach 1:
The LED chips are arranged in a balanced matrix configuration with equal spacing and orientation control, creating equipotential light distribution across the growth area. This ensures that all plants receive similar photosynthetic photon flux density, preventing the excessive light exposure that causes tip burn and other growth defects.
Solution Approach 2:
The patent incorporates adjustable mounting mechanisms that allow the LED board to be positioned at optimal distances from plants, and the LED chips themselves can be oriented at different angles. This dynamic adjustability enables fine-tuning of light distribution to maintain uniform intensity without creating harmful hot spots.
3Device complexity
If conventional LED lighting arrangements are used, then simple structure is maintained, but light distribution uniformity decreases leading to reduced yields
Solution Approach 1:
Multiple LED chips are merged into a single integrated board assembly, combining their light-emitting functions while distributing them in a uniform matrix pattern. This merging approach maintains structural simplicity compared to multiple separate lighting units, while achieving superior light distribution uniformity that increases overall productivity and yield.
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 solution ensures consistent light distribution, reducing defects and increasing yields by equalizing growth rates across the growth area, thereby improving the quality and quantity of plants or animals grown.
Implementation Method 1
an array of LED chips
Data Source
AI summary
An LED lighting sheet (20) for animal/plant growth includes an array of LED chips (21). At any location 50 mm away from the LED chips (21) in a lower region below the LED lighting sheet (20) for animal/plant growth, a photosynthetic photon flux density converted by input power and normalized by an average value over the lower region is greater than or equal to 0.2. A variation in photosynthetic photon flux densities respectively measured at locations 50 mm away from the LED chips (21) in the lower region below the LED lighting sheet (20) for animal/plant growth is less than or equal to 0.5 in standard deviation when normalized by the average value.