Blinding light leads to accidents that could prove fatal. Unsafe levels of light at this data point could lead to potential danger for an oncoming vehicle. If the headlight beam pattern is unfocused and creates a glare, the B50L test point will determine how dangerous the pattern is. The B50L test point represents the position of the oncoming driver’s eyes that are 50 meters from the headlights. Can you guess which ones? Let’s see if you are correct: Some of the data points are more important than others. The data points are marked as B50L, 25R, 25L, 50R, 50L, 50V, 75R, 75L.Įach data point represents a separate area of concern. There are many data points and lines in the ECE standard graphic, to further understand the graphic, we should look at the 8 main data points (highlighted in red) in the ECE standard. In general, there is a horizontal line and an angled 15 degrees oblique line that forms a clear horizon line in the ECE standard graphics. Now that we have a general understanding of the above image, we can look at the data points in the ECE standard one by one. Each data point indicates an area to be measured during testing. The ECE additional data points are intentionally placed within the area that the headlight beam will be illuminating.
The H represents the horizon line for the top of a headlight beam pattern. The V represents the centerline of the vehicle’s heading. There are two distinct lines that define the V and H axis: the Vertical line (V) and the Horizontal line (H). Notice the data points are intentionally lower than the windshield of the oncoming vehicle, except for one. If the headlight is properly aimed (yellow dot with red border) we can now see heights and angles determined by the ECE that determine the correct and safest pattern for a headlight beam. Let’s combine the drivers view with the ECE testing graphic. This is the traditional view you will have while driving on a single-lane road: Let’s break this down so we can understand the graphics and the standard. It is quite complicated at first glance, right?Įach point and line on the graphic are key to establishing an acceptable pattern for headlights. Let’s have a look at the RHT (right hand traffic) ECE light beam pattern graphic that defines the standard. Quite simply, this is the definition of an acceptable light beam pattern, but there is much more technical information behind the standard. The short answer is, YES! The keys to optimal performance are to be sure the light is focused in the proper position and it does not create glare or a safety hazard for oncoming traffic. But can this be achieved and still meet the standards set forth by ECE (E-mark) or SAE (DOT)? How do we define a safe and effective headlight beam pattern and what are the standards it has to meet? Most people would say they want a headlight that is super bright, covers a large area in front of the vehicle and has uniform illumination with no dark spots. Other standards used in other countries and areas (SAE/ADR) Some testing points that need to pay more attention toĤ.
The original ECE front headlight testing graphic combine with driveway imageģ. What does the original ECE front headlight testing graphic look like?Ģ. The following points will be addressed to help gain a better understanding:ġ. This article will discuss headlight beam patterns and the standards that agencies such as ECE/DOT require. Standards for Headlight Beam Patterns - edited by Kevin
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