GE PSFA Fiche technique télécharger pdf (Page 10)

Warm Up & Restrike Time

HID lamps require 3-7 minutes to warm up and will

not restrike immediately if there is momentary power

interruption. Some form of instant-on lighting,

usually one or two incandescent luminaries per pole,

is recommended to provide lighting during the 1-15

minute restrike time. In addition, the incandescent

(quartz) type fixtures should be used for emergency

lighting of the fields when required. HID fixtures with

optional “hot lamp restrike” capability are available

but this option is “hot restrike” only and does not provide

“instant light” when the fixtures are cold started.

Stroboscopic Effect

The light output of HID lamps tends to follow the

60-cycle current waveform. This will cause a moving

object to appear to flicker or jump from position to

position. This is most pronounced when the object

is small and traveling over 50 feet per second. If the

object is moving toward the player or the player is

following the motion of the object, strobe will be

less noticeable. This annoyance can be minimized

by using three-phase power with HID lamps. Metal

Halide lamps, do not produce as much stroboscopic

effect and can be used successfully on single-phase

power.

Design Criteria

The design information in this guide is based on

published lamp and luminaire performance that are

inherent in their design. Normal manufacturing

tolerances cause changes in a lamp’s electrical

characteristics and lumen output. Light changes in

reflector finish and lamp position can alter the

photometric distribution of the luminaire. Changes in

the ballast and line voltage will also alter the output

of the lamp. As a result of these variations average

illumination levels can be expected to vary within

10% of the design value. Individual point by

point foot-candle values can vary more than this,

especially when only a few luminaires are involved,

resulting in little overlap between luminaires.

Aiming Diagrams

Aiming diagrams for each sport should be requested

at the time the order is placed. The instructions for

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Sports Lighting

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GE PSFA Fiche technique Page 10

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