Beam pattern
- Updated:
- By: Kevin van Mierlo
Contents
What is a beam pattern?
Definition
The beam pattern is the way in which the light from a lamp is distributed across the space or surface you are illuminating: how wide, how far and how evenly. It is not the same as the light beam. The beam describes the angle of the light beams themselves, whilst the beam pattern is the actual result on the ground.
For work vehicles and machinery in sectors such as transport, agriculture and construction machinery, the beam pattern is more important than the number of lumen. Two lamps with the same light output can produce completely different results. An uneven beam pattern creates bright spots directly in front of the machine. This glare can strain your eyes and make the dark area behind it harder to see. To find out what beam patterns are available and which one suits your machine, read our article ‘Comparing the beam patterns of work lights’.
What factors influence the beam pattern?
- Light source: With the right optics, LED lighting can be directed more precisely than halogen.
- Optics: the lens determines how the light is distributed. An RFT lens ensures an even beam pattern, whilst a Fish Eye lens distributes the light differently.
- Type of work light: a flood beam illuminates a wide area at close range, for example around a tractor or excavator. A spotlight illuminates a narrow area at a distance.
- Mounting and adjustment: the height and angle of the light determine whether the beam pattern works effectively and whether you are dazzling colleagues on the ground.
How do you interpret an isolux diagram?
Lumen indicates how much light a lamp emits. The isolux diagram shows where that light falls. The axes show the width and length in metres. The lines or coloured areas indicate the lux value: the amount of light per square metre of surface area. This allows you to see at a glance whether a light reaches the sides of your machine or shines mainly far ahead.
Need help assessing a beam pattern or choosing a light? Please get in touch with us.
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Author
Kevin van Mierlo
Lighting expert at TRALERT® - Kevin tests lighting and finds out everything about legislation. He can tell you all about it.
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