Browse Publications Technical Papers 2006-01-0102
2006-04-03

Spectral Effects of LED Forward Lighting: Visibility and Glare 2006-01-0102

Light emitting diode (LED) forward lighting systems are rapidly being developed and will soon be on the road. One aspect of LED systems that will differ significantly from traditional halogen and high intensity discharge (HID) systems is their spectral power distribution (SPD). Of interest is how the new SPDs offered by LEDs will affect the visibility and comfort of drivers.
Recent studies have shown that headlamp sources that have more energy in the short wavelength region of the visible spectrum might result in increased discomfort to opposing drivers. Calculations were performed on LED sources to determine their relative potential to cause discomfort. Additionally, a field study was performed to determine the importance of discomfort and disability effects when LED sources are used in forward lighting systems as might be seen in practice. The results of these calculations and the field study are presented.
Studies have also shown that headlamp sources that have more energy in the short wavelength region of the visible spectrum provide benefits to the vehicle operator in off-axis target detection. Calculations were performed on a series of LED SPDs to determine their potential to stimulate rod photoreceptors. It was found that most of the LED sources analyzed can theoretically result in increased off-axis visual performance as compared to halogen and HID sources. The results of these calculations are presented and compared to field studies of headlamp spectra to determine the magnitude of these effects as potentially seen in practice.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Preview Document Add to Cart
Members save up to 16% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Human Perception of Narrow Band Width Light Sources

2006-01-0950

View Details

TECHNICAL PAPER

First “All-LED” Rear Combination Lamp –Challenges and Opportunities

2006-01-0287

View Details

TECHNICAL PAPER

LED Front Lighting – Optical Concepts, Styling Opportunities and Consumer Expectations

2006-01-0100

View Details

X