Source Four  (1992 - present)
Electronic Theatre Controls / ETC

Source Four

Official website: https://www.etcconnect.com/Products/Lighting-Fixtures/Source-Four/Source-Four/Features.aspx

Fixed Focal Length
Available in 575W or 750W variations:
Source Four 5 degree (360mm colour frame)
Source Four 10 degree (290mm colour frame)
Source Four 14/70/90 degree (190mm frame)
Source Four 19/26/36/50 degree (160mm frame)

Zoom
Source Four Junior Zoom 25 - 50 degree (160mm frame) 575W only
Source Four Zoom 15 - 30 degree (190mm frame)
Source Four Zoom 25 - 50 degree (190mm frame)
 

The Source Four (named after the four filaments of the HPL lamp) was invented, along with the HPL lamp, by Dave Cunningham and Greg Esakoff of Entertec in Los Angeles. ETC pays them a royalty from each fixture sold. 

Source Four Junior was retired in September 2024

Related Shows

• Martin Guerre
• The Curious Incident Of The Dog In The Night-Time
• The Phantom of the Opera (1986 - present)

Related People:

• David Cunningham

See also:

• HPL Lamp (1992)

Documents

Patent - David Cunningham (July 1991)
[External Website]

TCI Products of the Year (March 1997)
[766kb PDF]
From David Cunningham Collection

Source Four Evolution (2002)
[238kb PDF]
From David Cunningham Collection

Classic Gear - Source Four (June 2006)
[6.41Mb PDF]
From Lighting & Sound International

25 Years of the ETC Source Four (August 2017)
[External Website]

Source Four at 25 (October 2017)
[External Website]
From Lighting & Sound International

Exhibits in the Backstage Heritage Collection

Mini Source Four  
From Museum of Modern Showlighting Collection

Source Four 750  
From Museum of Modern Showlighting Collection

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