[quote=@Wade Wilson]
2) What colour would the 6th ranger be? We can't have white or black, since they are both colourless entities or something like that.
[/quote]

Since this is based on light, how could we [b]not[/b] have a white ranger?

OH!! We [b]should[/b] have a black ranger!

The shadow ranger!

If you wanted to go that way...