To my eyes;
V1 = A good warm white with good outdoor and sometimes good indoor color rendition.
Some of the nicest lights I have ever built for security use had these.
Not all of these were winners though.
A few of these have been a little on the petstain yellowish side with poor color rendition.
X1 = Used to frequently be catpee greenish to nonfat milk greenish.
Now many are quite white with just a slight hint of nonfat milk, catwhiz, mossy green, purplish greenish, or even a pleasant cyan overtone when you deliberately look for it.
When driven hard at full power, or slightly overdriven, these often whiten out nicely.
Outdoor color rendition is also often good with this one.
WO = white, grey-white, or white with a slight pink, or lavender tint.
These like to be driven at full power for whitest whiteness.
Pulse width modulated multibrightness lights seem to do especially well with these.
Good color rendition with this one anywhere you go.
As good as it gets for led imho.
XO = usually quite white at any power level.
Nice and white when underdriven, slightly purplish, or blueish when driven at full power.
Color rendition appears ok, but just not as good as WO IMO
A good choice for resistor based multiple brightness lights.
WA = Puky, or pinkish, or lavender dollhouse tint.
Sometimes looks like an old mercury vapor light in need of a new bulb.
Might be the perfect tint for girls though.
Walk into a girls room with one of these and you'll see.
Color rendition is so-so depending where you go with it.
YO = cyan - sky blue tinted.
When underdrive, it's often a slight bit greenish. :huh2:
At full power, it usually looks nice and HID like.
Color rendition often leaves a bit to be desired with this one though.
A bit more blue than some people are used to seeing.
YA - Purplish, blueish, or blue-pinkish.
Very HID like in appearance at full power.
Color rendition with this one isn't great either.
If anything, this tint can be the biggest eyesore for outdoor use.