Measurements in Automotive Lighting

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Course content

Introduction
- Lumens, Lux, and Candela EXPLAINED
- Consistency in Measurement 10 xp
  - Quiz
Lumens
Intensity and Illumination
- Intensity (candela)
- Isocandela Chart
- Illumination (lux)
- Distance
- Isolux (Bird's Eye) Chart
- Intensity Quiz 10 xp
Efficiency and Power
- Optical Efficiency
- Power
- Efficiency Power Quiz 10 xp
Beam Pattern
- Beam Patterns
- Spread
- Gradient
- Blending
- Output Images
- Beam Pattern Quiz 10 xp
Color
- Color
- Color Quadrants
- CCT
- CCT and Chromaticity
- Color Precision
- CRI
- Color Quiz 10 xp
Scoring Systems
- Baja Designs ELS
- Consumer Reports
- IIHS
- Scoring Quiz 10 xp
Final Test
- Test Instructions
- Final Test

Luminous Flux (lumens)

What is it?

How do we use it at Diode?

We use lumen measurements in a variety of ways, depending on the product:
Raw (or calculated) lumens
Measured lumens (full assembly)
Measured Lumens (PCB or partial assembly) (NOTE: PCB or partial assembly is not a valid Measured Lumens measurement - see next section for more information)
Effective Lumens

Note about Lumens and Color

Luminous flux is a measurement of visible light. Therefore, colored lights will always have far lower lumen values. The lowest is red, since red wavelengths are low power. Infrared lights have zero lumens since they are not visible. Instead these are measured in total emission power.