quinta-feira, 21 de dezembro de 2023

Glaring opportunity: How Nissan is countering a headlight dilemma


  • Nissan is improving headlight performance while reducing glare for oncoming traffic – a challenge that's especially important to address during the darkest time of the year
  • LED technology enables brighter lights while giving designers more freedom to create bold looks
  • Nissan engineers run headlamps through more than 300 tests before production begins

The increased illumination of LED (light-emitting diode) headlights creates a dilemma: It allows drivers to see more clearly ahead, but can cause additional glare for drivers in the oncoming lane. This has led to growing frustrations for nighttime drivers -- especially during the dark winter months.

With more than 90% of accidents caused by human error, Nissan is enhancing headlight technology as part of its mission to protect people and help drivers avoid risky situations.

Brad Chisholm is an engineer on the exterior Lights, Mirrors and Wipers team at Nissan Technical Center North America in Farmington Hills, Michigan. He says with advancements in LED technology, Nissan engineers can create headlights that enhance visibility for everyone.

"You want to see and be seen. LEDs can help with both," he said.

Engineer Brad Chisholm with a headlight and taillight assembly at Nissan Technical Center North America.

Precise patterns ease strain on other drivers' eyes

Over the last two decades, LED headlights have gradually replaced halogen and high-intensity discharge (also known as xenon) lamps. They're easy to distinguish: Halogen lamps emit a warm, yellow light, while LEDs emit a cool, white light. In addition to being brighter, LEDs are about 80% more energy efficient and last many times longer than halogen bulbs.

Critically, Chisholm says, LEDs also allow engineers to design a precise low-beam headlight pattern that both illuminates the road and reduces glare. This "anti-glare notch" makes it easier for oncoming drivers to see without being dazzled by approaching lights. The strongest, brightest light is aimed toward the lane of travel, while dimmer light is cast toward the oncoming lanes.

Engineers create these notches by directing the light in specific directions and creating physical barriers within the headlight housing to block the light in other directions. While these notches exist with halogen lamps and are required by regulations, they are more well defined with LEDs.

The headlight pattern of the 2024 Nissan Murano illustrates how its standard LED headlights clearly illuminate the road while mitigating glare for oncoming drivers.

"We have the ability to carve out that area of the oncoming lane with everything around it being bright and the inside being super dark," Chisholm said. "We're able to push the limits using LEDs."

Nissan offers LEDs as standard or optional equipment on all 2024 U.S. models. Additionally, High Beam Assist – which automatically turns high beams on or off based on traffic and lighting conditions – is included with Nissan Safety Shield® 3601.

Agencies like the Insurance Institute for Highway Safety (IIHS) are also testing for glare in their vehicle evaluations. In recent tests, both the Nissan Rogue and Murano received the IIHS' top headlight rating2. The agency noted that both crossovers' low beam headlights never exceeded glare limits. 

Achieving these results is an enormous effort – Chisholm says a Nissan headlight typically undergoes at least 300 tests before it is approved for production.

A gateway to daring design

LEDs also allow designers to push the limits of design, largely because they are smaller than halogen bulbs despite being more than twice as bright.

Recently, LED headlights have become even smaller. Why? Though LEDs produce far less heat than halogen bulbs, they still generate some heat that is absorbed by a piece of aluminum called a "heat sink." Over the past few years, heat sinks have shrunk due to LEDs becoming even more efficient, allowing designers to dream bigger.

"It gives us freedom for styling," Chisholm said. "We're able to do more with LEDs than we were able to do with halogen bulbs, like creating light pipes and swoops in taillamps and daytime running lights."

Nissan's all-electric Ariya is a perfect example, with its ultra-slim headlights and distinct daytime running lights.


2021 Rogue
2024 Rogue

The Nissan Ariya features bold, narrow LED headlamps (L) and striking daytime running lights (R). 

A brighter road ahead

Chisholm is excited for the future, especially since adaptive driving beam headlights have been approved for use in the U.S. These lights have the potential to move the anti-glare notch in real time to adjust for oncoming vehicles' positions.

"That's something I'm stoked about," Chisholm said.

And as halogen lamps gradually disappear, Nissan engineers are ensuring the newest generation of LED headlights continue to delight drivers without dazzling those facing them.

LED headlights are standard on the Nissan Altima, Ariya, Armada, GT-R, Maxima, Murano, Pathfinder, Rogue and Z.

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1. Nissan Safety Shield technologies can't prevent all collisions or warn in all situations. See Owner's Manual for important safety information.
2. For more information, see IIHS.org.

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