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Light sources for stage and TV studios

Some people often guess that all theater lighting uses special types of bulbs. In fact, theaters use not only ordinary bulbs for general lighting facilities, but also do not require precise optical control. What is used are wide-angle floodlight bulbs of various specifications (from 150 watts to 1000 watts), slatted light cabins and floodlights (floor lights) and other simple lamps.

Floodlights This type of lamp requires the use of accurately positioned dense filament bulbs and more accurate optical control. Its disadvantages are that it has a short service life and is limited in certain angles of use. But regardless of its disadvantages, it is currently widely used on stage or in the studio.

Halogen lamps This type of bulb has been widely used on stage since its invention. At present, the manufacturers of this type of bulbs and the manufacturers of lamps cooperate more closely than ever before, and both sides have achieved satisfactory results. The successful development of the double-filament halogen tungsten lamp is perhaps the most effective example of the cooperation between the two parties. It is more adaptable to use in TV studios than any other single-filament bulb. The main advantage of halogen tungsten bulbs is that they can always maintain a constant light color throughout their life. Tubular halogen tungsten lamps are also commonly used on stage and in the studio, especially for floodlights in semicircular perspective backgrounds (sky curtains) and the soft light side of dual-purpose lamps.

Discharge lamps Although this type of lamp has a high light efficiency, it is not very good for the stage and studio, because this type of lamp can only be dimmed by mechanical equipment, and the switching equipment is not practical, mainly because it requires a certain warm-up time and cannot be started immediately after extinguishing, so it is not very useful and is only used to create special effects. Only the recently invented short-arc metal halide bulb can be used in some special effect lamps. For example, it has a high light intensity and good color rendering performance when used in chase lights. Because chase lights are operated by hand, the light output can be controlled by devices such as visors or variable apertures.

The sound of the lamp This is a phenomenon that has only been discovered in recent years. It is an annoying "by-product" produced by the thyristor dimmer. When the power is turned on, not only when the power is interrupted but also when the waveform is distorted, the wires in the bulb will produce magnetostriction, thereby emitting a very annoying high-pitched sound. When the bulb is used in an open-type dipper floodlight, the buzzing sound is amplified and causes considerable trouble for direct microphones. If the wire of a halogen tungsten photography bulb is made of non-magnetic material, the effect of magnetostriction can be reduced to a very small level.

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