GE SHOWBIZ manual Fusing of Tungsten Halogen Studio and Theatre Lamps, Max. surge current amps

Page 58

Surge Current

The cold resistance of a halogen studio lamp is approx. 1/17 of its value in normal operation. On switch on, theoretically a surge current of 172 x the normal current would flow and depending on the thermal mass of the filament* this will fall to the lamp normal current in approx. 1 sec. In practice this maximum theoretical current does not appear due to (a) switch on does not always occur at the peak of the AC voltage, (b) the supply has some impedance which is comparable with the cold resistance of high wattage lamps, i.e. maximum possible surge current where V is the applied voltage and Z is the sum of the lamp cold resistance and the supply impedance.

Typically supply impedance is the order of 0.3 ohm and lamp life is based on testing with such a supply. In the rare cases where the line impedance is lower than this figure, an adverse effect on life may be encountered particularly with high wattage types, due to the then extremely high surge current on switching.

lamp

type

cold

max. surge current (amps)

 

 

 

normal

 

 

resistance

line impedance =

 

 

 

operating

 

 

(ohms)

0 ohms

0.1 ohms

0.3 ohms

0.5 ohms

current

240V

10kW

0

.34

1000

774

530

405

41.5

240V

5kW

0

.7

486

424

340

283

20.8

115V

5kW

0

.15

1085

650

360

250

43.5

240V

2kW

1

.7

200

189

170

154

8.35

117V

2kW

0

.41

404

324

233

182

17.1

240V

1kW

3

.4

100

97

92

87

4.15

Fusing of Tungsten Halogen Studio and Theatre Lamps

A lamp normally fails at end of life by fusing of the filament. Often an arc then forms and as there is little resistance to limit the current this rises to a very high value which if maintained can result in a serious overload on the envelope and seals. This might result in the lamp shattering. A quick acting high breaking capacity fuse must be connected in the supply line in all applications. Suitable types are given in BS88 (IEC 60269), IEC 60127 or IEC 60241.

lamp

fuse (rated current)

 

 

 

 

 

power

(amps)

 

 

 

 

 

 

(watts)

100-115V

115-130V

220-250V

500

6

 

 

6

 

 

4

 

650

10

 

 

6

 

 

4

 

1000

16

(15

UK)

10

 

 

6

 

1500

20

 

 

16

(15

UK)

10

 

2000

25

(30

UK)

25

(20

UK)

10

 

2500

35

(30

UK)

25

(30

UK)

16

(15 UK)

5000

63

(60

UK)

50

 

 

25

(30 UK)

10000

125

 

100

 

50

 

110 GE LIGHTING - SHOWBIZ™ ENTERTAINMENT LIGHTING CATALOGUE

GE LIGHTING - SHOWBIZ™ ENTERTAINMENT LIGHTING CATALOGUE 111

Image 58
Contents GE Consumer Products Introduction Contents Symbols PAR Lamps PAR 36 Ferrule cap PAR LampsPAR 36 Screw Terminal cap FBE DWEFBO 120PAR56/VNSP PAR 46 Medium Side Prong capPAR 56 Screw Terminal cap 240PAR56/VNSPQ500PAR56/NSP PAR 56 GX16d capPAR 64 Screw Terminal cap Q500PAR56/MFLPAR 64 GX16d base Emep PAR 64 GX16d cap Emep HPL High Performance Lamps Single Ended HalogenG9.5 base GCT GCVGCW GCSGX9.5 base G22 base G22 Low VoltageGY16 base BTM FKBEGE FKFFKK CYXDPY GX38q base Twin filament DKX/DSF DKZ/DSEDTA Linear Halogen Lamps Cnbc Europe’s StudioLength 79.4mm Linear HalogenLength 95.3mm EJG EHMFCL FCMEKM Specialist Projector Lamps Overhead Projector, Acco UKSpecialist Projector Single-ended Quartzline Projector LampsCBA A1 Class Projector Bulbs G17q capEPS M29/ESA Low Voltage single-ended capsuleMains Voltage single-ended capsule M30/ESBLinear Projector Lamps MR-16 Faceted Dichroic ReflectorMR-16 Dichroic Reflector ENL FHXEPT EPZMR-11 Faceted Dichroic Reflector MR-13 Faceted Dichroic ReflectorELS/ELR High Intensity ArcEZG Discharge Lamps CSD 250/2 MGM Grand, Las VegasNew Single Ended Cold Start Discharge lampsSingle Ended Hot Restrike Double Ended Hot RestrikeDouble Ended Ceramic Metal Halide CMHSingle Ended ‘Minis’ PARElliptical Diffuse Elliptical ClearTubular Clear 30555 Special bipin base 2 pin 9mm30558 2933330563 Special Bipin base30560 3056130371 3056730360 30372PFC F55BX/CINEMA32 F36BX/CINEMA32F36BX/CINEMA56 F55BX/CINEMA56T12 Explanation of codes Technical informationLamp Bases Special and Experimental LampsFilament Format Rated Average Life CP Range of Lamps for Fresnel and Spotlight Fittings‘T’ Class Lamps for Theatre Spotlight Fittings Light Centre Length LCL Approximate Colour TemperatureTypical Working Distance Maximum Overall Length MOLOperating precautions Operating positionVBD=90 VBU=90Lamp may shatter and cause injury if broken Ansi notice for Stage & Studio unshielded lampsFilament designation C2V C7ALamps for Ellipsoidal Spotlights Lamp capsLinear and ‘U’ Lamps for Studio Lighting 3200K GE Lighting Showbiz Entertainment Lighting Catalogue Arc Prevention in Tungsten Halogen Studio Lamp Applications Lamp performance as a function of operating voltageQuartz envelope Filament Lamp comparison and constructionTypical high wattage studio lamp Quartz bridge Quartz envelope Filament hookVibration, handling, cleaning Lamp performanceFrom Typical Dimmer System 5kWFusing of Tungsten Halogen Studio and Theatre Lamps Max. surge current ampsCompact Source Iodide CSI Discharge Lamps Compact Iodide Daylight CID Discharge LampsCompact Source Special CSS Discharge Lamps Cap/bulb interface capsule lamps 450 maximum Operating Temperature of Discharge Studio LampsBulb Fusing of Discharge Studio and Theatre Lamps Pins 350C maximumSpectral distribution of luminous flux lumens for Broadcast IndexOutside EXE EXG FBE FBO FCX FCW FFN FFP FFR FFS FGN Theatre lamps by LIF code Lamp type TV Film & Studio lamps by LIF code Theatre TV Film & Studio lamps by Ansi code Lamp type GKV/LL Single Ended Cold Start Double Ended Hot restrikeCSS Specialist Projector lamps by Ansi code EJV EJY EKE EKX EKZ ELB ELC M28 M29 M30 M32 M33 M36 M38 M40 GE Lighting World addresses Latvia MACEDONIA, SERBIA, MontenegroPeru United States of AmericaVietnam

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