Keep in mind that what is modeled is just an infra red spot light. Vary range limited. Depending on which tank and position in the tank (commander t62) range is vary limited. Depending on light conditions it seems that 800 meters is about as far as you can see. If its a vary dark night its awful. But arty guys with flares fix that.
In the time frame of game image intesifiers where pretty rare items unless associated with a first rate power and brand new (or rebuilt) armor.