LIGHT MEASUREMENT FOR SOLAR STREET LIGHTING SYSTEMS
Photometry of Solar Street Lighting Systems
Solar street lights have three important brightness metrics: candela, lux, and lumens.
- Lumens represent the amount of light output.
- Lux represents the luminous flux per unit area.
- Candela represents the luminous intensity in a specific direction.
Methods for Measuring Brightness, Luminous Intensity, and Illuminance
Lumens: Lumen values are measured using an integrating sphere. The lumen value of a luminaire is typically labeled on the product packaging, allowing buyers to directly assess the brightness of the luminaire based on the lumen value.
Lux: Lux is measured using a lux meter.
Candela: For simple measurements, a portable photometer can be used. However, for engineering projects, a large professional radiometer is required to generate a complete report.
Here is a table summarizing the key points:
| Metric | Definition | Measurement Method |
|---|---|---|
| Lumens | Total amount of light emitted | Integrating sphere |
| Lux | Luminous flux per unit area | Lux meter |
| Candela | Luminous intensity in a specific direction | Photometer (simple measurements) or radiometer (engineering projects) |
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