AtheistArchon said:
These have always been colored in some manner, never just white light.
Um, no.
You've only seen signal flares, most likely the non-parachute ones (what we call star clusters), which generally are colored. However, white signal flares exist, also, and are used for battlefield illumination. Also, almost all the artillery launched or vehicular launched flares are white, for illumination purposes. Our artillery would launch white flares every night over the town nearby, from 8Pm local to about 10PM. Always white. Provided visibility for patrols in the area.
Even with night vision we still use flares for illumination, because NVGs are not very good for detail, leave out color, have problems with contrast, restrict field of view, have a slight magnification effect making it hard to do up-close work (like checking your indicators and radio dials inside the vehicle), and just don't provide the equivalent of normal, lighted vision. In a situation like Iraq illum flares were great, because the enemy did not have long-range weaponry that could target the flare source (not to mention artillery launched flares, and even hand-held illum flares, don't light up until after the top of their arc, making source identification difficult to impossible). Also, considering that we had all the tanks and helicopters, and they had very little that could take those out, the light was considered more beneficial than not.
Anyway, the formations of the lights do seem to be more precise than flares, as even with little wind the flares will move around in relation to each other.
To get to my point, outside an immediate combat or emergency situation (where signalling is important and can't be done via radio), you're more likely to see white flares than anything else.