How high do Sky Lanterns fly?
This depends on the following factors: Size of Lantern, Size of heat source (fuel cell) Ambient temperature at launch site (Ground Degrees Celsius/Fahrenheit) Temperature fluctuations at various heights above launch site (Air Temperature) Location of Launch site (valley, mountain, launch site shaded by wind etc) Wind speed and direction at launch site (Ground) Wind speed and direction above launch site (In Air) *Lanterns top altitude can be modified, to suit regulatory restrictions, which apply in some countries.