Lighting blueprint planning light, color, and contrast as narrative tool — locked before production to ensure visual consistency across all scenes.
You don't plan your lighting setup on the shooting day itself – you define it beforehand. The L.C. Concept (Lighting Concept) is precisely that: a systematic advance planning of how light, color, and contrast should function throughout the entire film, or at least over cohesive sequences. It's less an instruction for individual scenes and more a visual grammar that you coordinate with the director and the production designer – before the first light is plugged in.
In contrast to classic lighting techniques, which often happen reactively on set, an L.C. Concept works proactively. You define: Which color temperatures dominate? How hard or diffuse should the light be? Which contrast ratios between key light and shadow determine the visual language? A film with a dark noir approach requires different lighting constants than a sun-drenched coming-of-age story. If you write this plan beforehand – ideally with mood boards, look tests, perhaps even a digital 3D simulation of the lighting setup – you save time on set and ensure continuity, even if you're shooting for weeks and natural conditions fluctuate.
Practical work usually begins with a lighting legend: Where is the key light positioned? How is it qualified? What color tint does the fill carry? Are you working with practical light sources or only with HMI/Tungsten? A good L.C. Concept documents such decisions in a way that the gaffer and his crew can work reproducibly on the shooting day – even if the DoP isn't present every second. This is particularly valuable for object changes, parallel shoots, or when you need to stage similar rooms in multiple locations.
Important: An L.C. Concept is not rigid. It's a framework that allows for flexibility. If a better solution spontaneously emerges on set, or the location dictates different lighting conditions, you adapt – but always with reference to the overarching plan. This distinguishes professional lighting design from mere improvisation. You document changes so that post-production in color grading or VFX work remains consistent. This makes the L.C. Concept also a means of communication between all departments: camera, sound, direction, and later editing and DI.