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

Spread

Spread is a simple definition of the width and height of a beam pattern, in degrees.

We usually say this in width by height. For example, 80x10 is 80 degrees wide, and 10 degrees tall.

Can be used to define a beam pattern (80x10) or actually name the product (30-degree Spot, etc)
Difficult to define because light always trails off to the sides. Where do we “cut off” our measurement? At the brightest area? Is it 10x10 or 12x12?
In the optical world, a mathematical “cutoff” definition is used called FWHM, or full-width at half-maximum, to describe beam spread.

We use this term to describe output to customers, and as general guidance for engineering.