CCT Mode

Overview

The CCT Mode (Correlated Color Temperature Mode) is one of the fundamental operating modes for color-tunable LED lights in film and TV. In this mode, the fixture operates exclusively with white light and can be continuously adjusted along the color temperature axis from warm (tungsten-like, low Kelvin values) to cool (daylight-like, high Kelvin values). It is therefore in contrast to HSI Mode (Hue, Saturation, Intensity), in which the same fixture produces saturated colors.

The CCT Mode is the mode in which an RGBWW fixture is most frequently operated in everyday use, as most set situations require clean, tunable white light – for example, to match daylight coming through a window or existing practical lights.

Functionality

To ensure white light remains color-accurate across a wide Kelvin range, many fixtures use an RGBWW configuration: in addition to red, green, and blue LEDs, two separate white emitters are installed – one tuned to artificial light (tungsten) and one to daylight. When adjusting the color temperature, the control electronics mix these sources, resulting in better color rendition than pure RGB mixing.

Two parameters are typically adjustable in CCT Mode:

• Color Temperature (Kelvin): Shift between warm and cool light.
• Green/Magenta Shift (Tint): Correction along the green-magenta axis to match fluorescent or mixed light environments or to intentionally set a tint.

Typical Values Example

The usable Kelvin range and functionality vary depending on the model and manufacturer. Two common examples:

The values show the range: smaller on-camera lights often only cover the classic bi-color range (approx. 3200–6500K), while high-end tubes reach significantly further into extreme warm and cool light.

Set Usage

In CCT Mode, lights are matched to the existing lighting mood without the need to use physical conversion gels (CTO/CTB) or tint gels. Via DMX or apps, the color temperature and tint of multiple lights can be set centrally and reproducibly, which helps with larger setups and when restoring a look after shooting interruptions. The separately controllable green/magenta shift also reduces correction effort in post-production when working against mixed light or fluorescent sources.