Machine Vision Illumination - STEMMER IMAGING


Widest choice of technologies to maximise

the visibility of your object

Phlox LLUB

Very bright, long lifetime backlight with a multitude of size and colour options

Phlox LLUB backlights are lit by a linear array of LEDs using a light pipe structure to redirect the light to the surface of the diffuser. The CO2 laser etching process of the diffuser allows a combination of refraction and diffusion to improve backlight luminance. This allows up to 80% of the injected light to be re-emitted from the surface with a fan angle of 30°.

Thanks to mathematical modelling, Phlox backlights emit light in a deterministic and perfectly controlled manner.

Reasons to choose the Phlox LLUB

Exceptional luminance and uniformity

The luminance of the light ranges from 18.000 to 35.000 cd/m², depending on the actual size. Thanks to a fan angle reduced to 30°, most of the light is directed to the camera sensor, therefore the illumination efficiency is improved. The LLUB provides a uniformity of over 95% (+/-10%): Phlox delivers each backlight with a data and distribution chart that specifies uniformity and luminance.

Several standard sizes available

Phlox offers a variety of standard sizes for the illumination: 20x20, 50x50, 100x100, 200x200, 150x40, 160x120, 300x220 and 400x200 mm.

Choice between several wavelengths

The light is available in white (5000°K), red (625 nm) and IR (850 nm). Further wavelengths can be supplied upon request.

Extended lifetime

The LLUB sports an extremely long expected lifetime, with more than 100.000 hours and less than 20% luminance loss.

Minimised chromaticity shift

The chromaticity shift is smaller than 10% over the complete LED lifetime. Recalibration (white balance) of the system is therefore generally not necessary, even for colour sensitive applications.

Industry grade housing

IP65 rating permits the use in harsh environments without the need for additional housing. This reduces the costs but also allows for a more flexible integration.


  • Type: high luminance LED illumination
  • Colour: white (5000°K), red and IR (850 nm)
  • Uniformity: > 95% (+/-10%)
  • Lens: fan angle reduced to 30°
  • Size: 20x20, 50x50, 100x100, 200x200, 150x40, 160x120, 300x220 or 400x200 mm
  • Protection: ultra slim housing with 8,5 mm thickness, IP65 rated

Markets and Applications

Phlox backlights are especially useful in applications requiring high uniformity, luminance and chromaticity stability over a long period as well as a high resolution.Typical applications are particle measurement and shape control, as the LLUB requires much sharper outlines than a generic omni-directional light.