If there is a number followed by another token (like a keyword), the 
current POV-Ray parser allows you to skip the whitespace. For example:

diffuse 0.6ambient 0.1

For numbers in the 0-1 range, you don't really need the leading 0 here, so:

diffuse .6ambient .1

And in this particular case, where the number starts with a period 
instead of a digit, you can even do this:

diffuse.6ambient.1

Same goes for negative numbers, which start with a dash instead of a digit.

I'm using diffuse and ambient just to give an example. In practice, you 
would use *nothing* according to Mike's tip #4 :) But this tip is useful 
for other keywords.

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