For each type of light you must specify the intensity, this is either a red- green-blue triple indicating the colour of the light or a single value (providing "white" light).
If no light source is specified, a directional light with an intensity of 1.0 with a vector of (1, -1, 1) is used [Rayshade User's, Guide Chapter 4].
Note that the light sources themselves are always invisible!
light intensity ambientThe "background" light present in a scene, there can be only one ambient light, if more than one are defined the last is used.
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THE END - Notes on Rayshade - 3 - Lighting and Atmospheric Effects