UV exposure has been shown to cause discolouration of some target surfaces. The cause of surface discolouration is repeated and lengthy cycle times, which are necessary when stationary light sources target faraway surfaces. Stationary UV systems are calibrated to operate cycles long enough to deliver desired dosages to the targets which are furthest away, but this method leads to those systems delivering doses greater than is necessary to nearby targets. Over time, the treated surface materials may change noticeably.
Thanks to its targeted surface-by-surface application, Dimer’s UVHammer delivers required proven dosages every time and consistently across each surface. In addition to reducing time requirements, minimising distance and reducing cycle times prevents the likelihood of oversaturating – and potentially damaging – any target surface.
Angle of Incidence & Canyon Wall Effect
Even the smoothest of surfaces feature microscopic divots. This texture provides pathogens with ‘hiding’ places from a fixed UV light source by shadowing the pathogens from the lamp’s line of sight. This phenomenon, known as the ‘canyon wall effect’, was first discovered by Dimer’s very own Dr Kreitenberg.
Surfaces like floors, chairs or countertops will always be covered in these microscopic textures. It is therefore particularly important to understand the canyon wall effect in the context of how UV lamp orientation on textured surfaces affects the kill rate of contaminants (see illustration below showing why a vertical UV source is not compatible with effective treatment of horizontal surfaces).
To be most effective, UVC lights must be angled so that the lamps are parallel to the target surface, ensuring perpendicular and complete exposure of all lingering particles. Dimer’s novel intellectual property ensures Dimer products are the only mobile solutions able to achieve this improved functionality. It is worth noting that most high contamination surfaces are horizontal.
According to a Georgia Institute of Technology study (Jaffe, 2020), airborne bacteria are 98% more likely to land on a horizontal rather than a vertical surface.
Line of Sight
In a 50m² operating room setting, a traditional UVC system would require a five-minute to 15-minute cycle in at least three locations, while furniture and other items are rearranged between cycles in an attempt to reduce shadowed surfaces.
Dimer’s mobility is multidimensional compared to first-generation UVC solutions. An adjustable wing extends from a mobile base, operated at a walking pace to quickly deliver proven germicidal dosages to every surface in any environment. A Nationally Recognised Testing Laboratory (NRTL) has proven Dimer’s ability to disinfect a 50m² operating room in less than five minutes.