We have been exploring the possibility of creating new lighting effects by using daylight-balanced and UV light sources simultaneously. The two light sources produce inherently different effects, which can conflict with each other and detract from the overall image. At the same time, new possibilities are opened by breaking the conventional rules of thumb. Often, these new approaches are discovered by playful experimenting on the set, rather than by pre-planning the shoot.
Here is my recent blog post about this for The Black Light Magazine.
—
UV light photography is typically done in a dark studio and, until recently, with a relatively long shutter speed to maximize the intensity of the fluorescent light. As a result, “black light” photographs have a distinct look that features high tonal and colour contrast, a black background and a distinct bluish-purple colour cast produced by the visible portion of the LED or strobe lights.
First, when daylight-balanced light is used in conjunction with a source that is strongly biased towards the violet and ultra-violet side of the spectrum, managing the resulting colour cast, i.e. setting the white point correctly, becomes a challenge not only in the camera settings, but also in post-processing. This technical issue can be overcome relatively easily by using coloured gels on top of the UV-filtered strobes. The only drawback of this approach is that the gels further limit the intensity of the light, which has already been greatly reduced by the UV filters.
The second issue with mixing the UV and visible light is more conceptual, and it has to do with the type of image that can be created. Considering a portrait of a model with fluorescent makeup, for example, we quickly discovered that as we made the relative contrition of conventional, daylight-balanced strobes more prominent, the portrait became more and more, well.., conventional. This happened because the distinct colours and contrast of the fluorescent makeup became less prominent and significant in the overall image.
In order to maintain the impart of the fluorescent makeup, we found that it is effective to break the conventional rules of lighting the model. Specifically, instead of diffusing the incident light, we used a small, directed light source that created harsh shadows on the model’s face, i.e. sharp transitions between the light and the dark areas. This way, the fluorescent makeup, which was located in the deep shadows, was not affected by the white light and was very prominent in the resulting image.
In conventional portrait photography, particularly in “beauty” portraits, harsh light is avoided as being unflattering to the model. However, when the creative process features unconventional techniques like UV light and fluorescent paints, the solution to arising conceptual problems often lies at the extremes, or even is the exact opposite, of established guidelines. In this respect, the creative process is similar to scientific discovery, where researchers are advised to look for new insights at the fringes of the explored areas.
