Tech

In figure 1 we see the projection of two gobos.

You notice that in the one on the left the part that should be black looks gray, so much so that you can also see the stick placed in front of the gobo. It may appear that “some light” passes through the parts that should be black in the gobo. In reality this is not the case. The phenomenon is in fact due to the so-called “back reflections”, that is to the reflections of the light on the lens as shown in figure 2.

The ideal condition for projecting images occurs when the projection surface is perpendicular to the light beam, even if this condition cannot always be obtained for various reasons. Actually, tilting the projector affects the size of the projected image, so the greater the tilt angle, the greater the unwanted effect. From the optics we know…

The discharge lamps, used in the Golive and Golux series of gobo projectors, need auxiliary electronics, to supply the correct ignition voltages and to regulate the electrical flow inside the bulb during operation, consisting of ballast and ignitor. The igniter initially starts the electric arc, supplying a high voltage pulse (1-5 kV peak) and the…