I find the way Poser adds lights with a random colour and off center is annoying. I zerowed the the translations, and rotations of a spotlight, and set its colour to white. I then used Ctrl+C to Copy the data, and Pasted it (Ctrl+V) into a text file.

I can copy the text and paste it into a light to give me a zeroed white light. The same file should work on any type of light.