public HaloRenderData setColourIndex(int colourIndex) {
            levelGlowRgba = getBaseColour(colourIndex, HaloContext.LEVEL_GLOW);
            inventoryGlowRgba = getBaseColour(colourIndex, HaloContext.ITEM_GLOW);
            bloomRgba = getBaseColour(colourIndex, HaloContext.BLOOM);
            return this;
        }
Colours used for Halo glow and bloom effects. They are traditional Minecraft
wool colours with scaled brightness components to reduce variation in
perceived brightness.
core/src/main/java/mrtjp/projectred/core/client/HaloRenderer.java