A luminaire produced by Altman in 1974, discontinued in 2015, and likely the most popular ERS ever.
View attachment 4061

Available in five different beamspreads:
Lenses (Field/Beam)
4.5 x 6.5 (55°/22°)
6 x 9 (37°/16°)
6 x 12 (26°/11°)
6 x 16 (19°/8.5°)
6 x 22 (11°/8°)

Cost. New, approximately 2/3 that of the ETC Source Four, and very inexpensive on the used market.
A simple design that has had minor improvements over the years
Durable, easy to maintain

No dichroic reflector, high gate temperature unkind to shutters and gobos
No rotating barrel, some shutter angles impossible to achieve
No interchangeable lens tubes
Not rated for over 750W, although many users put 1000W FEL lamps in them, which can lead to premature socket, shutter and lens failure.
No drop-in iris or accessory slot

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