thanks for your words, but i still can't see them.
I am in open beta 2.5.6.52437
i have tried full night, in differents maps, with and without fog, all the others lights are ok but not the formation light even if i try very hard to see them
i put a image in the next post where all lights are off except formation light
thanks again for your help ..maybe a problem in my computer .. but strange because everything else works fine