PRE-PRODUCTION • Lighting Gels | Research

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Lighting gels are used to balance the colour of light sources, adjust contrast and control shadows. Using these gels helps cinematographers and videographers to create different moods and looks. 

Colour Conversion Gels


CTB stands for ‘Colour Temperature Blue’ but is often referred to as ‘daylight’. CTB is used transform tungsten light sources such as traditional household lightbulbs from 3200K to 5600K. This is a commonly used gel for balancing artificial light sources to daylight which the main lighting source is natural sunlight. 

CTO stands for ‘Colour Temperature Orange’ but can be referred to as tungsten. This does the opposite in that it converts light sources from 5600K to 3200K. 

Diffusion is used to control the softness and shadows and the softer the source the less prominent the shadows will be. There are many different types of diffusion, some of which include ‘heavy diffusion’ which lightens a shadow dramatically and gives the shadow a much softer edge. 

 ND stands for natural density and is used to reduce the intensity of the light without changing the colour. Often used in landscape photography, they can more depth and colour contrast to an image.  
Example of an ND Filter 

For our first test shoot, we used the Rotolight without any gels or diffusers to see how it would look just on it's own. Due to the fact that with the Rotolight you can change the settings like brightness and temperature, we were able to create a natural looking daylight with the artificial light by adjusting the temperature to 5600K. However we didn't find that from the brightness that we would need to project enough light, there were some small hotspots on some of the objects in the scene. As seen in the image below, there was some hotspots on the sofa and some reflection/shine. During our next test shoot, I want to also try out some light ND filters to reduce some of the intensity of the light and some Diffusers to give the lighting a softer look and feel. 

Test Shoot 1 - Image 1


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