Not a guru by any means but in simple terms, you can use another parameter, or set of parameters to control the Diffuse Value, should you wish.

Example: You have a piece of chest armour which is, say, red and you want there to be a bit in the middle to glow blue. Create a texture map of the bit you want to glow, with the red part in white and the glowing part in black. Connect this to Diffuse_Value. You'll see there's now a black area on the armour, right?

Select the Ambient Channel, set that to Blue and Ambient_Value to 1, or any other value, depending on the brightness you want. Connect an inverse version of your texture map to this, either using a math node to invert it, or by creating one in Photoshop.

You now have a red bit and a blue glowing bit with no conflict between either.

There are limitless uses, depending on your needs. BB is quite possibly the absolute all time expert in using any and all of the nodes to best advantage, so no doubt he can give you many more ideas.

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