Quasar Science - Help Center

The Spectrum Control DMX parameter is found in our RGB VW and VRGB DMX profiles (i.e. P23-P24 and P53-P66) and only applies to relative colorimeteric Color Spaces (Rec709, sRGB).

Why Spectrum Control? Not all LED's produce the same results at the same settings so the Spectrum parameter allows you to adjust the whitepoint and color response of the RR-R2 to try and match the Quasar Science color spectrum to a different manufacturer's LED diode set.

Full Spectrum (100%) uses the RGBTD LEDs of the color system to produce light output with the broadest spectrum (Highest SSI). This is default setting in our provided Lighting Console Profiles.

No Spectrum (0%) uses only the RGB LEDs to simulate older "spikey" color output (Lower SSI). The Spectrum parameter allows you to fade between these two states 0% - 100%.

Since video RGB signals work with a relative colorimetric space, changing the white balance should change the grayscale color but also maintain the color differences throughout the image versus the grayscale color. This behavior lines up with the concept of a Relative Colorimetric space that maintains color and light behavior.

Going Deeper

Let's look at this example: For the given CIE 1931 x, y chromaticity coordinate for 3200K white light, the diagram below shows the Spectrum settings of 0%, 50% and 100% for 3200K. Each setting would provide the x, y chromaticity value that matches 3200K but with a different SSI.

The ability to change the Spectrum provides both a technical and creative means to truly control the fixture’s entire range of output with the use of a single dmx parameter.

A technical application might involve matching other lighting sources on set with similar LED diode sets:

A creative application could involve intentionally producing color changes without changing the image’s white balance:

For further information, please deep dive into the Quasar Science color engine within our RGBX Spectral Science section.