GE SHOWBIZ - Manual (Page 57)

GE LIGHTING - SHOWBIZ™ ENTERTAINMENT LIGHTING CATALOGUE 108
100
80
60
40
20
0
300 400 500 600 700 800
wavelength (nm)
relative energy
Total spectral energy distribution of typical
studio lamp
Spectral energy distribution can be shown in absolute terms whereas
radiation in terms of visible light is related to the response of the
human eye. (Spectral distribution chart on previous page)
3400K
3000K
3200K
Operating Temperature of Tungsten Halogen
Studio Lamps
The following maximum and minimum temperatures are suggested
for optimum life. Operation outside these figures will not
necessarily cause immediate failure but will affect life adversely
to an increasing extent.
Seal - 450°C maximum
Above this figure the sealing foil oxidises at a rate increasing with
temperature and is frequently the cause of short life due to seal
failure.
Bulb - 250° - 800°C
Outside this range the halogen cycle becomes less efficient and
blackening may occur. Temperatures above 1200°C will cause
the bulb to soften.
Pins - 350°C maximum
Above this figure the plating on the pins may lose adhesion and the
contact will deteriorate. Such deterioration may form local hot
spots which rapidly worsen and may result in arcing and
irrepairable damage to both lamp and holder. Should signs of this
be evident on removal of a failed lamp, it is important that a good
contact is restored by replacing the lampholder before the next
lamp is fitted. Otherwise the new lamp will rapidly fail in a similar
manner.
GE LIGHTING - SHOWBIZ™ ENTERTAINMENT LIGHTING CATALOGUE 109
100
80
60
40
20
0
0.5 1.0 1.5 2.0
time (sec)
light
2.5kW
5kW
2.5kW
5kW
From mains
From Typical Dimmer System
2.5kW
5kW
From constant current source
Turn on time of studio lamps