研究目的
To construct the experimental set of light distribution analysis for demonstrating the characteristics of various lamps.
研究成果
The LDR-based illuminance meter achieved an average error of 4.52% with a standard deviation of 4.85, validating its use for light distribution analysis. Fluorescent lamps with reflectors showed the widest light distribution, high bay lamps the narrowest but highest illuminance, and down lights the lowest illuminance. Incandescent lamps provided the highest illuminance among same luminaire types. This experimental set aids in understanding light distribution for effective lighting system design in buildings.
研究不足
The LDR illuminance meter has higher error at low illuminance levels (up to 26.26% error in 0-100 lux range), and the experimental setup is confined to a small room (1.5x1.5x1.5 m), which may not represent real-world lighting conditions. The system relies on specific hardware (e.g., DAQ-6008) and software (LabView), limiting adaptability.
1：Experimental Design and Method Selection:
The experimental set was designed to analyze light distribution using a closed room, LDR sensor for illuminance measurement, and LabView for data display and motor control. The rationale was to provide a hands-on tool for understanding light distribution characteristics. Theoretical models included the inverse relationship between LDR resistance and illuminance, and exponential correlation between voltage and illuminance.
2：Sample Selection and Data Sources:
Four types of lamps were tested: 14W complex fluorescent, 60W incandescent, 7W LED, and 36W fluorescent. Three luminaires were used: down light, high bay, and fluorescent reflector. Selection was based on common types in lighting systems. Data was collected from illuminance measurements at various angles.
3：List of Experimental Equipment and Materials:
Equipment included a closed room (
4：5x5x5 m, made of steel and plywood), LDR sensor (200 mW), resistor (3kΩ, 500 mW), stepping motor, DAQ-6008 interface card, motor drive, power supply (15 VDC), computer with LabView, and standard lux meter (LX1010B). Materials were lamps and luminaires as specified. Experimental Procedures and Operational Workflow:
The lamp was rotated from -90° to 90° in 5° steps using the stepping motor controlled by LabView. Illuminance was measured by the LDR at each angle, with data recorded and displayed on the computer. Each test was repeated five times for reliability.
5：Data Analysis Methods:
Data was analyzed using LabView to convert voltage signals to illuminance values based on calibration equations. Statistical analysis included calculating average error and standard deviation compared to a standard lux meter.
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