Lamp comparison and construction – GE SHOWBIZ User Manual

Page 52

GE LIGHTING - ENTERTAINMENT LIGHTING CATALOGUE

Lamp caps

Typical caps used on the Photographic lamps listed in this catalogue are shown below along with
their IEC codes and normal names or common abbreviations. The IEC codes are used in the
majority of table entries. Note that the illustrations are not to scale.

R7s

G6.35 GY6.35

GZ6.35

G7.9 (std. volts)

GX7.9 (Low volts)

Ferrule Contact

Small Indexing Ring

(Ring is a full circle)

E26

E12/15

BA15d

P28/25

E39

5.5 mm

GY5.3 (Flat pins)

BA15s

P30s P30d

P40s

Large Indexing Ring

(Ring is flat opposite pin)

Double Contact

Medium Ring

G17q GX17q

G22

GX5.3 (Round pins)

2 button

GY9.5 GZ9.5

GE LIGHTING - SHOWBIZ™ ENTERTAINMENT LIGHTING CATALOGUE

Lamp Comparison and Construction

Lamps for Ellipsoidal Spotlights

A problem is encountered with some ellipsoidal spotlight luminaires due to the fact that a portion of
the reflected beam of light is directed onto the cap of the lamp designed for Fresnel fittings. This
leads to overheating of the cap and seal which may result in premature lamp failure.

GE have therefore designed lamps intended for use in ellipsoidal spotlights where the size of the cap
has been reduced and the neck length correspondingly increased, thus removing the critical seal
area from the reflected radiation and ensuring that optimum lamp life is obtained.

Linear and ‘U’ Lamps - for Studio Lighting 3200K

Whilst a comprehensive selection of lamps for spotlight fittings is important to the lighting director,
of almost equal importance is a range suitable for the many different fittings now on the market
which use tungsten halogen lamps of tubular construction. GE believe their range gives a wide
choice and is unmatched in performance and reliability.