We started by analysing existing lens solutions and found that they did not provide satisfactory results in rooms with low ceilings. It quickly became clear that a new type of lens was needed that could do more than conventional diffusers - it had to direct light outwards in a targeted manner and work independently of the LED pitch. A high degree of flexibility for use in different luminaire families was a key requirement from the outset.

The second phase of development focused on the study of light refraction and reflection. We developed initial prototypes using different materials, including clear, textured and matt surfaces. We quickly realised that the perfect solution would be a combination of different surface structures and innovative geometry.

The breakthrough came with the development of a micro-convex lens structure at the top of the lens. This small but crucial adjustment fundamentally changed the way light was refracted and distributed. The micro-fine structure allowed light to be rotationally symmetric and evenly scattered outwards. The result was a much more homogeneous illumination with no hot spots.

A key aspect of the development was the use of the Batwing lens with Tunable White. The flexible adjustment of colour temperature and the resulting mixing of light colours was a major challenge. Initial attempts to develop separate channels for different colour temperatures were promising, but too complex and costly to manufacture. We needed to find a solution where all colour temperatures could be evenly distributed using a single lens shape.

We developed a continuous channel system within the lens that allowed the Tunable White applications to be integrated into the Batwing lens without compromise by carefully balancing material density. Care was taken to develop a geometry that is independent of the pitch (LED spacing), which simultaneously directs the light outwards and mixes the individual light sources well. At this stage of development, fine grooves were visible on the surface, but these did not yet produce the desired light pattern and were therefore further refined.

We worked hard to optimise the surface and came up with a solution that involved a gently curved structure throughout. However, the transparent material we chose meant that the LEDs remained clearly visible, which detracted from the visual appearance.

In the final stage of development, we paid particular attention to the fine polishing of the material. The surfaces of the lens were partially frosted to ensure even greater homogeneity of the light-emitting surfaces, while the light-entry and reflector surfaces remained polished to ensure maximum light output. The material of choice: PMMA satin, which not only has excellent refractive properties, but is also durable and resistant to yellowing. After numerous tests and simulations, the perfect geometry was achieved - a lens that distributes the light over a large area and provides consistent diffusion for any application.

Even with low ceilings or limited suspension heights, the Batwing Lens provides uniform illumination without annoying hot spots or shadows.

The combination of different surfaces within a single linear lens ensures maximum uniformity and efficiency on any surface.

The special structure on the upper side of the lens ensures rotationally symmetric mixing of the light beams and prevents spotlighting.

Thanks to a continuous channel system and carefully matched material densities, the Batwing lens seamlessly adapts to different colour temperatures without compromising homogeneity.

The Batwing Lens is optimised for different luminaire families such as Slider, Hypro-F and Slider-F and can be flexibly adapted in length, width and LED spacing for future profile systems.