I think the answer is no? But let me break it down for you.
So it would never just be light or something like that, since light magic is normally illusory. You aren't just becoming the illusion of something, you're transforming into it. That's where you get the dark or earth from. You must have one of those two. Most have dark.
As for adding fire or water - I don't see how or why that would be necessary. If you added on 'transforms in a cloud of electricity' that would be an upgrade to the magic, and so yes, would require spark. But that has nothing to do with being transformation magic.
Does that make sense?
When you have transformation magic you can do one of two things:
1. You can transform into two separate things once upgraded
2. You can transform into one thing, and give yourself a power that that thing has.
Example: Iso can transform into a bird and a dragon. Alune can transform into a dragon that breathes fire (I think .. it does something else, anyways). Iso's dragon form can never breath fire, and Alune can never transform into someone other than a dragon (using that one magic slot, anyways).
HELPFUL??