"Another quick way in the materials is to set an ambiance color to the iris.  This sometimes, works, and sometimes doesn't, depending on lighting and so fourth.  But you can give it a shot."

"But it does not take the place of light---it may light up more, but it uses the available light--- not create light. So your lighting is always critical. "

Both incorrect. It does take the place of light. The probe light node is creating response to a light that is not there.

As well, the Ambient_Color * Ambient_Value is rendered directly - no light needed.

Try all of these. Turn off or delete all your lights. Plug your texture into Alternate_Diffuse, or Ambient_Color (with Ambient_Value=1). The texture is rendered directly. Lights have nothing to do with it.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)