Automotive lens technology

NACAROAD has been developed on the basis of a clever projection lens system that allows for a very compact design while providing maximum performance at the same time.

The light, which comes from only one LED, is optimally directed, refracted and distributed very efficiently as a homogeneous carpet of light on the road – scattering losses are thus reduced to a minimum. As a result, NACAROAD shines brighter than products from other manufacturers despite comparatively lower lumen/lux values (see FAQ).

The surface of the lens body is additionally hardened for external impact and equipped with an anti-reflective coating. A sharp cut-off line prevents the glare of other people in traffic.

LightSKIN sets new milestone

LightSKIN is known for combining the latest technologies with a discreet, fully integrated design to provide the highest possible practical benefit and attractive appearance. NACAROAD sets a new milestone for LightSKIN by establishing strategic collaborations with ETENDUE LIGHTING lighting technology specialists in the automotive industry.


I used to ride a road bike with my friends after work. Since we rode the same course every day, we kept the pace fast even at night. Then one night, one of my friends fell down on a downhill. Unfortunately, he suffered a back injury and needed months of treatment. The reason he fell was because of damage to the road at the corner. However, if the moment was daytime, he could have prevented the accident.

‘We have accidents because we don’t see the roads as much as we need at night.’

I was motivated by watching the process and aftermath of the accident. Because my job was automotive headlamp engineer. I’m sure that he could have prevented accidents if he had used engineered lighting at the level of automotive headlamps.


I wanted “cyclists to be safe at night even in the most dangerous moment!”

We think the most dangerous moment of riding is

‘Meeting a downhill corner on a wet road.’ (except for traffic accidents) 

The minimum braking distance for stopping a bicycle at a speed of 60 km/h on a wet road is generally known to be about 25m. ( Considering the human reaction time of 1 second, the minimum stopping sight distance is 42m. Considering the curvature of the road, the light intensity in the direction of 25° left and right should be 3lx or more (@10m).


With glare-free from the opposite, the maximum front sight distance of 72m is realized. Maximum horizontal viewing angle of 52°.

Aerodynamics from aviation

For maximum drag reduction, the design matches the aerodynamic shape of the NACA airfoil.
This results in an industry-leading drag coefficient of only 0.267. At 45 km/h, the energy consumed by aerodynamic drag is only 0.48 W. At the same time, the aluminium housing ensures durability and optimal heat dissipation.

  • Road lighting distribution by brightness mode.

NACAROAD is a headlamp optimized for road bikes. The shape designed according to the naca airfoil allowed us to achieve a drag coefficient of 0.267. At the same time, the performance of the headlamps is excellent. A lens incorporating automotive projection lens technology realizes a perfect cut-off line at a height of only 2cm and meets the 45km/h regulation (ECE R113 class B). The aluminum housing ensures durability and heat dissipation. It supports waterproof rating IP66, and the usage time is 1.5h to 7.3h, and the weight is 160g. NACAROAD is developed by Etendue Lighting, an automotive headlamp engineering company in Korea and high-end lamp technology partner of LightSKIN.

Safety like in broad daylight

Long, intense and fast-paced training rides are now possible even in absolute darkness – without compromising safety. The extremely wide field of vision is reminiscent of car headlights, which illuminate roads and their surroundings evenly over long distances.

The tunnel effect that often occurs when driving at night is therefore not existent. Even in curves, hardly any change of riding style is necessary.

NACAROAD aerodynamic performance

Air resistance is minimized through the design following the NACA airfoil shape.(Cd, drag of coefficient : 0.267)

Drag, or air resistance, is the force of the wind on an object in the direction of the wind. It is composed of pressure drag (pushing/pulling normal the surface) and friction drag (sliding over the surface). In most cases the pressure drag is dominant. The drag coefficient is a dimensionless quantity that indicates the aerodynamic resistance of an object moving through its medium. It is defined as follows:Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.

The scale below illustrates typical Cd values (NASA and Wikipedia). More streamlined objects will have a low Cd, less streamlines objects will have a high Cd. The Cd of your project has been indicated as well. Please note that this is an indicative figure, mainly suited for comparing different concepts. For a highly accurate value, contact at

When it is driven at a speed of 45km/h, the energy consumed by air resistance is only 0.49W. (It is only 24% compared to the reflector type product.)

The Cd provides a measure for the aerodynamic efficiency of an object. By approximation, the actual drag force Fd on the object as well as the power required to propel it will vary in function of the wind speed according the following formula:

For your project, that leads to the force & power curves shown below. Please keep in mind that this curve is an estimation, based on extrapolation from the simulation wind speed. For more accurate forces at a given velocity, please perform a simulation for that velocity.


Install on GoPro Mount
After installing on the mount, illuminate the lamp on the wall from a distance of 2m and fix it so that the cut-off line is located 3.5cm below the product height. The user’s eyes are more comfortable by attaching the bicycle computer or anti-glare shield.


Lighting specification by brightness mode.

Max power → Sports mode → Touring mode → City mode

  LED Flux[lm] Max illuminance point[lux, @10m] Power Life time
Max power 520lm 90ux 5.3W 1.5h
Sports mode 400lm 70lux 3.3W 2.4h
Touring mode 220lm 50lux 2.0W 4.0h
City mode 140lm 30lux 1.1W 7.3h