Here's a lowdown on the surefire's I own in basic terms:
FLOOD: L4, L2, A2(low mode)
THROW: A2(high mode), E2L, E1L, G2
MEDIUM: E2e, E1e
check out the selection of SF's reviewed at flashlightreviews.com. You can get some definitive numbers on output and throw there, making it easy to compare lights.
Good luck, welcome to CPF
Josh
EDIT: sorry, didn't notice till later that you specified LED's. a basic rule of thumb I've personally noticed is that the 3watt LED's tend to have a higher color temp than the 5watters. My L4 and L2 are both a warm tint. My KL1 is quite bluish. Tint will vary from light to light, but this observation of mine seems to be pretty consistent.