Updates To The Design
The ETC Source Four, released in 1992, updated the traditional ERS design being utilized by companies such as Altman Lighting. The company took advantage of advances in lamp and reflector technology to increase luminous output with less wattage. The Source Four name comes from the improved lamp design utilizing 4 filament elements.
Other improvements included the use of a single lens in most lens trains, making the unit lighter and more efficient in regards to light output, and a rotating barrel containing lens tube assembly, shutters, and accessory slot to allow increased precision in use of the shutters and/or more easily registering gobos.
Altman Lighting released their Shakespeare line of units in 1994 as a response to the Source Four. Inferior quality control in casting of the bodies, larger and heavier units (approximately 25% heavier), less efficient lamps and a faulty tilt adjust system has resulted in Shakespeare units being much less popular than the Source Four. One improvement over the Source Four is a wider range of adjustment in regards to rotation of the barrel assembly.
Read more about this topic: Ellipsoidal Reflector Spotlight
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“Joe ... you remember I said you wouldn’t be cheated?... Nobody is really. Eventually all things work out. There’s a design in everything.”
—Sidney Buchman (1902–1975)