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Intensity distribution (emergency light)
Detect the light intensity distribution of the sample, combined with the product installation layout and local regulations in the installation area, to determine whether it meets the requirements of emergency lighting
Light intensity distribution detection is an important testing method for evaluating the light intensity distribution of emergency lights (such as emergency lighting fixtures, evacuation indicator lights, etc.) in different directions to ensure that they can meet the requirements of emergency lighting in actual installation and use. Determine whether the light intensity distribution of emergency lights meets the standards by combining the product layout of the installation area with local regulations. The following is the detailed content of light intensity distribution detection:
1. Test purpose
Assess the intensity distribution of emergency lights in different directions to ensure their coverage meets the requirements of emergency lighting.
Determine whether the intensity distribution of emergency lights meets the requirements based on the layout of the installation area and local regulations.
Verify whether the product design can effectively guide personnel evacuation and ensure life safety.
2. Testing principle
Measure the light intensity distribution of emergency lights at different angles (horizontal and vertical) using a photometer or distributed photometer, generate a light intensity distribution curve or equal intensity map, and evaluate their coverage range and uniformity.
3. Testing methods
(1) Determine test parameters
Measurement distance: determined based on actual usage (such as 1 meter, 2 meters, etc.).
Measurement angles: typically covering horizontal angles (0 ° -360 °) and vertical angles (-90 ° to+90 °).
Environmental conditions: Conduct testing in a dark or semi dark room to avoid interference from ambient light.
(2) Measure the distribution of light intensity
Measure the light intensity of emergency lights at different angles using a distributed photometer or photometer.
Record the light intensity data of horizontal and vertical angles, and generate a light intensity distribution curve or isointensity graph.
(3) Assess coverage
Evaluate the illumination coverage range of emergency lights based on the light intensity distribution curve.
Ensure that the light intensity distribution can cover key locations in the installation area (such as evacuation routes, exits, etc.).
(4) Combining installation layout and regulations
Determine whether the light intensity distribution meets emergency lighting requirements based on the layout of the installation area (such as room size, channel width) and local regulations (such as minimum illumination requirements).
Calculate the illumination value of key positions to ensure compliance with standards (such as ≥ 1 lx).
(5) Uniformity assessment
Evaluate the uniformity of light intensity distribution to ensure that there are no obvious dark or overly bright areas within the illuminated area.
Calculate the uniformity (minimum illuminance/average illuminance) to ensure it meets the standard requirements (such as ≥ 0.4).
4. Testing standards
International standards:
ISO 30061 (Requirements for emergency lighting).
IEC 60598-2-22 (Safety requirements for emergency lighting fixtures).
Industry standards:
GB 17945 (Fire Emergency Lighting and Evacuation Indication System, China).
EN 1838 (Emergency Lighting and Sign Lights, Europe).
5. Testing equipment
Distributed photometer: used to measure the distribution of light intensity.
Photometer: used to measure the intensity of light at a specific angle.
Darkroom or semi darkroom: used to provide an interference free testing environment.
Illuminometer: used to measure the illuminance value at key positions.
6. Data analysis and evaluation
Intensity distribution curve: Generate intensity distribution curves for horizontal and vertical angles to evaluate coverage.
Equal intensity map: Generate an equal intensity map to visually display the distribution of light intensity.
Illuminance calculation: Calculate the illuminance value at key positions based on the distribution of light intensity to ensure compliance with standards.
Uniformity assessment: Calculate the uniformity of the illuminated area to ensure there are no obvious dark or overly bright areas.
7. Common problems and solutions
Insufficient coverage: It may be due to the unreasonable design of the lighting fixtures, and the optical design of the lighting fixtures needs to be optimized.
Insufficient illumination: It may be due to insufficient light source power or unreasonable installation height, and the light source power or installation height needs to be adjusted.
Poor uniformity: It may be due to uneven distribution of light sources or unreasonable reflection design, requiring optimization of light source layout or reflector design.
8. Application scenarios
Fire safety: such as detecting the light intensity distribution of emergency lighting and evacuation indicator lights.
Building safety: testing of emergency lighting systems in office buildings, shopping malls, and hospitals.
Industrial safety: such as testing emergency lighting systems in factories and warehouses.
9. Test report
Test conditions: including measuring distance, measuring angle, environmental conditions, etc.
Test results: including light intensity distribution curve, isointensity graph, illuminance value, uniformity, etc.
Conclusion and Suggestions: Evaluate whether the sample meets the relevant standards and propose improvement suggestions.
By detecting the distribution of light intensity, the lighting performance of emergency lights can be comprehensively evaluated to ensure that they can meet the requirements of emergency lighting in actual installation and use, effectively guide personnel evacuation, and ensure life safety.
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