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Ring Lights for Machine Vision

Ring Lights for Machine Vision

Ring lights are circular arrays with several LEDs which are used in combination with Machine Vision cameras. These industrial ring illumination is suitable for homogeneously illuminating both large and small working distances. With their modular design and a broad range of light colors, they fit and solve numerous applications – manufactured by wenglor.

Illumination Methods Using Ring Lights

Machine Vision ring lights are most commonly used in one of these illumination methods, depending on the working distance (WD).

Low Angle for Short WD

The LMLX low angle light emits light with an angle of incidence at 45°. It can even create an efficient darkfield effect at close working distances.

Brightfield for Medium WD

The LMRX modular ring light without any accessory creates a highly diffuse and very bright light, suited for matte surfaces and fast moving objects. 

Brightfield for Large WD

The ZVZF1 ring light emits light with up to 150,000 lux illumination intensity, thus creating a brightfield on large working distances.

LMLX Low Angle Light

The LMLX low angle light is a combination of the LMRX modular ring light and a ZMRG low angle accessory that allows an angle of incidence at 45°.

This vision ring light is ideal for inspecting features on shiny parts and highlighting edges, indents, protrusions and scratches. Applications for this product includes the inspection of dot-peen marked and several types of DPM codes.

Illuminated Features

Improper illumination – the dot-peen marked code cannot be read.
Illuminated with LMLX low angle light – the dot-peen marked code can be read properly.

LMRX Modular Ring Light

The LMRX series are a range of powerful light rings with a high density of LEDs, providing a wide illumination cone and a lot of diffusion. They cover a large field of view from working distances of 100 mm up to 600 mm. These square ring lights are suitable to illuminate objects with matte surfaces or fast moving objects which require high brightness.

Maximum Modularity

Starting from a diffuse LMRX ring light, the addition of a low angle accessory and dome accessory change the way the light is diffused and directed towards the target.
The LMRX ring light is availabe in two different sizes with different minimum working distances.
LMRX10x LMRX20x
Inside Diameter 80 mm 130 mm
Minimum Working Distance 60 mm 50 mm
LMRX10x
LMRX10x 80 mm 60 mm
LMRX20x
LMRX20x 130 mm 50 mm
The following overviews indicate the brightness values for the different working distances measured in ring configuration with white light in continiuous mode. In strobe overdrive mode, brightness is four times higher for LMRX10x and 3.8 times higher for LMRX20x.
Thanks to its unique round/square shape, the LED sections of the modular ring light are divided into four sectors that can be activated in different ways.

Via the control panel, it is possible to choose between 4-sector lighting and 2-sector lighting, thus turning the ring light into two parallel bar lights. Additionally, each individual sector can be activated via remote control (optional M12 × 1, 8-pin).

Sector lighting is available for all light sources (infrared or white and red or cyan).

M12 Standard Connector with Five Male Pins

As a standard, the LMRX ring lights are connected via M12 connector with five male pins. This connection includes the following functionalites:
  • Power (24 V DC)
  • Selection of different operating modes (continuous or strobe mode)
  • Dimming from 100% to 30% brightness

Optional M12 Connector with Eight Male Pins

For remote control, the LMRX modular ring light can be connected via M12 connector with eight male pins. 
This connection method is needed to use the following additional options the LMRX series offers:
  • Individual sector control
  • Color control
  • Enabling the operating mode strobe overdrive
  • Keypad locking
The following overview shows the different levels of homogeneity in relation to the working distance and the field of view respectively.
 
The flatter the chart, the better the homogeneity.

LMRX10x Machine Vision Ring Light

  • Working distance: 50 mm
  • Field of view: 150 × 120 mm
  • Working distance: 100 mm
  • Field of view: 150 × 120 mm
  • Working distance: 200 mm
  • Field of view: 200 × 150 mm
  • Working distance: 300 mm
  • Field of view: 250 × 200 mm

LMRX20x Machine Vision Ring Light

  • Working distance: 80 mm
  • Field of view: 200 × 150 mm
  • Working distance: 200 mm
  • Field of view: 200 × 150 mm
  • Working distance: 300 mm
  • Field of view: 250 × 200 mm
  • Working distance: 500 mm
  • Field of view: 400 × 300 mm
A LMRX ring light can also be used by putting both the light and the camera at a low angle between the target surface and the normal to the surface. This method is useful for reducing glare and highlighting edges, scratches and engraved markings, such as dot peen marked codes on shiny metals.

Lockable Control Panel

  • Select the color of the ring light (white/infrared or red/cyan)
  • Select the lighting sector

Rugged Design

  • IP65 protection
  • Aluminum heatsink for extended lifetime

Modular Structure

  • Dome and low angle accessories can be mounted easily
  • Quick feasibility studies

Different Operating Modes

  • Continuous or strobe mode
  • Strobe overdrive for high speed applications

ZVZF1 Ring Light

ZVZF1 ring lights are very powerful and bright LED light rings with an illumination intensity of up to 150,000 lux. They are ideally suited for uniform illumination. Thanks to 360° annular floodlighting, shadows can be reduced and image quality can thus be improved. They have narrow LEDs in mono-color and are available in white, red or infrared light.

These Machine Vision ring lights are suitable to illuminate objects with matte surfaces or fast moving objects which require maximum brightness.
A ZVZF1 ring light can also be used by putting both the light and the camera at a low angle between the target surface and the normal to the surface. This method is useful for reducing glare and highlighting edges, scratches and engraved markings, such as dot peen marked codes on shiny metals.

Comparison of the Different Machine Vision Ring Lights

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