GE SHOWBIZ manual Typical Working Distance, Light Centre Length LCL, Maximum Overall Length MOL

Typical Working Distance

For Multi-Mirror®and other reflector lamps and MARC™ lamps, the Working Distance shown is the distance from the front surface of the reflector rim to the film plane, in the optical system for which the lamp was first designed. In most cases, it provides a uniform plane of light for the intended aperture.

Light Centre Length (LCL)

This dimension defines the location of the filament in relation to the lamp base. It is measured from the geometric centre of the filament to a specified point on, or plane through, the base. Light Centre Length is subject to manufacturing tolerances.

Maximum Overall Length (MOL)

This dimension includes the lamp bulb and all rigid parts of the base. Since

the listed lengths include maximum tolerances, actual lamps are generally slightly shorter.

Approximate Initial Lumens

The value shown is based on spherical photometry, at rated voltage, of lamps that have been seasoned for approximately 15% (or a minimum of 2 hours) or more of their rated average life.

Approximate Colour Temperature

The radiation within the visible spectrum from tungsten filament lamps is similar in spectral distribution to that from a “blackbody” at specific colour temperatures. The Colour Temperatures shown are approximate initial values in Kelvin (K) for lamps operated at rated voltage.

As the spectral distribution of MARC lamps does not conform to that of a “blackbody”, the values shown are ‘correlated’ colour temperatures expressed in Kelvin.

88 GE LIGHTING - SHOWBIZ™ ENTERTAINMENT LIGHTING CATALOGUE GE LIGHTING - SHOWBIZ™ ENTERTAINMENT LIGHTING CATALOGUE 89