I have here a simple scene, lit with a linear fallof point light and a skylight.
Open the file, render persp view. The light will be tinted greenish. Select the light, change the color to a reddish tint. Render again, the image will be tinted red. Now change the light color again to something else, for example purple. Render again, the render will look red again, the light change is not visible. The only thing to do to get the light color change to render, is to select the light, go up and down in the falloff types (make sure you really highlight another falloff type by using the arrows and clicking in the field again). Select the linear again and render: now the change is visible.
http://www.aversis.be/vrayrhino/light_color.zip
Open the file, render persp view. The light will be tinted greenish. Select the light, change the color to a reddish tint. Render again, the image will be tinted red. Now change the light color again to something else, for example purple. Render again, the render will look red again, the light change is not visible. The only thing to do to get the light color change to render, is to select the light, go up and down in the falloff types (make sure you really highlight another falloff type by using the arrows and clicking in the field again). Select the linear again and render: now the change is visible.
http://www.aversis.be/vrayrhino/light_color.zip
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