To avoid the risk of triggering fires in the stage it is important to keep in mind that projectors used by lighting engineers electricians need be installed at a distance from objects and surfaces more or less flammable. In fact, in order to prevent overheating, you should keep a safe distance between the projector and the surface to be illuminated. This distance is indicated on the label side of the projector. The measure indicates the minimum allowed distance between the beam and the illuminated surface.
As for the halogen lamps is considered that the temperature reached by the filament may be more than 1400 degrees centigrade and it is precisely this high temperature that allows the particles to break away from the tungsten filament and connect with the halide gases before they reach the 'glass envelope of the lamp. Then come back to the particles of tungsten filament where halogens are released that take part in a new cycle. Because of the high temperature reached by the lamp and dispersed simultaneously requires that the manufacturer indicates a minimum distance of the materials in the vicinity of the lamp. Of course there will be a material difference if we're going to light will be a scene of a fire retardant fabric or plastic. The distance shown is of course referring especially to the highly flammable materials but it is still a distance to be respected forever.
For those who had direct experience of events occurring for non-compliance with this safe distance above may seem unimportant. I have personally witnessed
twice to trigger a fire, fortunately offset by prompt intervention by the operators themselves, set design or tailoring of materials. Take into consideration the safety distance is a precaution that will surely eliminate any possible risk.
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