The Baby Spotlights described here
and on the following pages are fully
complementary in design and performance. A full range of interchangeable
accessories ensures a wide application.
The Pattern 23, 250/500 watt Baby Mirror Spotlight
projects a clear cut beam of a
a mask . It is ideal for stage lighting from the Front
of House and has many applications where stray
light cannot be tolerated . It can even be used to
project rudimentary cloud and other cut-out masks.
Thousands of these lanterns have found a use in
architectural lighting , in ballrooms, display and
exhibition work, picture and poster lighting, etc.
OPTICAL DESIGN
Front and rear reflectors collect a large solid angle
of light from the lamp and pass it through a gate of
any desired shape, and an objective lens projects
this as a clear cut beam of the same . profile as the
gate . This arrangement produces a light output
equivalent to two or three times the wattage of a
normal spotlight .
BEAM ANGLES (largest mask, sharp focused)
Patt. 23 (one 3t-in. dia. objective lens) 22°
Patt. 23F (one 3t-in. dia. fresnel objective lens) 30°
Patt. 23W
(two 3t-in. dia. objective lenses) 37°
Patt. 23N (one 6-in. dia. objective lens) 11°
Beam Angle . The angle in which the intensity of the beam vari es in the
ratio of
2:1. In a Profile spot th e sh arp cue-off e nsur es virtually no light
outsid e this ang le .
profile determined by
LAMPS (Specify medium prefocus P.28 caps only)
I.
Class
T/3
T/1
B1/7
tAngle of tilt applies to filament flat on, not edge on . No t ilt is permissible
in the latter direction. The line between the tilting bolts on the lantern
MUST be kept hor izontal .
Wattage length
250
500
250
light ce ntr e
55·5 mm
55·5 mm
55·5 mm
Safe tilt
from cap down
90°t 200
90°t 200
135°
[ife
(hours)
800
DIMENSIONS
A 11 279
B 12 305
*C (approx .) 13! 337
•For Patt . 23/ N thes e dim ens ions are increased by 6t in. (165mm ).
In. mm I
In. mm
D 8 203 G 4-! 114
E 3 76 H 4j 121
4-! 114 *J (approx .) B! 216
F
I In. mm
WEIGHTS
Patt. 23 and 23F: 6j lb (3kg).
Patt. 23W : 71b (3·2kg) .
Patt. 23N and 23N /RH:
Page 2
B!lb (3·9kg).
I
VARIABLE BEAM SHAPE AND SIZE
All models are supplied with four metal diaphragm
plates of fixed but different diameters . Optional
accessories are an Iris Diaphragm (ref . 363) for
varying the diameter of circular beams, and a
removable four-sided Adjustable Mask (ref. 364)
which will provide any shape of four-sided beam .
These masks slide into the gate provided (see 4 in
section opposite). A mask of any desired shape may
be cut from thin metal or
or other scene may be used. A greatly reduced
aperture will result in a loss of intensity, and
therefore a larger aperture with a narrower angle
objective lens is usually preferable. The edges of
the beams
(ref . 374 or 375) in front of the objective lens.
I
a mica slide with a cloud
cari be softened by using a diffuser glass
FOR USE AS A ' FOLLOWING ' SPOT
For 'following' purposes, or when a spotlight will
have to be handled frequently, any of Patt. 23 spotlights
carr be fitted with a heat-resisting rear handle
providing this is specified at the time of ordering
by adding the suffix
The one exception is the Patt. 23N which has to be
re-pivoted on account of the out-of-balance weight
of the narrow angle lens front . This lantern fitted
with a rear handle is identified as Patt.
-/H to the pattern number.
23N /RH .
BUILT-IN SHUTTERS
When the lantern will be required to project a
variety of rectangular beam shapes, four independent gate shutters operated by means of external
knobs may be fitted providing this is specified at
the time of ordering by adding the suffix
pattern . number. This variant is available on all
models except the Patt. 23N/RH. An iris diaphragm
cannot be used, but the gate will accept ref. 366
metal diaphragms or purpose-made masks.
-/S to the
Page 3
p
APPLICATIONS
The Pattern 123 Fresnel Spotlight is used whenever
it is required to build up an area of light to a much
greater level without however defining the edges
of the beam. The size of the peak area to be lit can
be adjusted accurately by means of the knob under
the lantern and the soft edges of the beam will
ensure a gentle transition from one lighting level
to another. The lantern may also be regarded as an
adjustable flood to provide wide but
localised coverage.
The Pattern 123 is ideal for stage lighting on the
stage itself where rapid spread is essential. Focused
back, it gives a narrow intense beam suitable for
sunlight effects. The lantern is very suitable for
television and photographic studios and there are
many applications to display and exhibition work.
For the last two, the motorised colour wheel is
particularly advantageous.
ne~ertheless
BEAM DISTRIBUTION
Patt. 123 Beam Angle 10° - 35°
Field Angle 20°
- 45°
Patt. 123W Beam Angle 20° - 40°
Field Angle 30°
Beam Angle. The angle in which the intensity of the beam varies in the
ratio of 2:1.
Field Angle (formerly known as Beam Angle). The angle in which the
intensity of the beam varies in the ratio of 10 :1.
- 55°
LAMPS (Specify medium prefocus P.28 caps only)
Class
----
T/3
T/1
B1/7
tAngle of tilt applies to filament flat on. not edge on. No tilt is permissible in
the latter direction . The line between the tilting bolts on the lantern MUST be
kept horizontal.
Wattage
250 55·5
500
250 55·5
Light centre
length
I
55·5
mm
mm
mm 135°
Safe tilt Life
from cap down (hours)
I
90°t
90°t
200
200
800
DIMENSIONS
A 11
B
11!
C
10!
279
292
267
D 8 203 G
E
F
63
2!
5 127 J 5 127
H
4 102
140
Sf
mm In. mm In. mm
In.
WEIGHT
S}lb (Hkg).
Page 4
p
OPTICAL DESIGN
Optiq1lly. the Pattern 123 has the same high efficiency as the Pattern 23 but the character of the
light beam is completely different. It produces an
intense beam variable between spot and flood with
soft and indeterminate edges . The optical system
which produces this result is a large diameter
lens formed in concentric steps with back surface
broken up to make the beam smooth and free of
filament striation .
BARNDOOR ATTACHMENT
The size of the lens and its break up qualities make
it tend to scatter very low intensity light outside
the confines of its beam. In most instances on a
lighted stage or in a photographic or television
studio, this scatter is too slight to matter. However,
there will be cases on a dark stage close to a wing
or a cyclorama or other backcloth when this stray
must be cut off. To do this a Ref. 132 4-door barndoor attachment is clipped to the front and rotated
to suit the particular circumstances. Any or all of
doors can be moved and used in conjunction
the
with the
beam and stray light to the area required.
'.focusing on the lantern to confine the
BLACK RISER LENSES
These can be supplied for a slight extra charge to
reduce the need for barndoors in theatre work .
Add suffix
LEAD SCREW FOCUS MODEL
Where, as in television and photographic work,
frequent refocusing of the lantern is likely a lead
screw giving easy, precise adjustment from a knob
at the front of the lantern under the lens can be
specified at the time of ordering by adding the
suffix
TELEVISION MODELS
The Pattern 123 is also available with pan, tilt and
focus pole attachment . B.S.
spigots (Ref. 592) are avai I able for the Pattern 123
and Pattern 23.
-JC to the pattern number.
- /LS to the pattern number.
1-i\--in. dia. hollow T.V.
Page 5
•
23
C
E
These accessories fulfil the dual functions
of a remotely operated colour-change for
stage purposes, and also a continuously
rotating colour wheel suitable for dance
halls, display work, etc. The assembly slides
into the front colour runners of the lantern.
Control is by means of a rotary switch
mounted in a Control Box. This, however,
is unnecessary when continuous ;rotation
only is required.
COLOUR CHANGE WHEEL AND DRIVE
The driving unit consists of a uni-directional selfstarting synchronous motor suitable only for a
50 or 60- A.C. supply (specify voltage). The wheel
has five apertures for 'Cinemoid' colour filters and is
fixed to the driving shaft by means of a milled nut.
Speed-four revolutions a minute .* Each Colour
Change Wheel must have a separate set of switchcontacts at the Control Box.
Ref. 382 Motor driven colour change wheel for Patt. 23,
Ref.
Ref.
Ref. 388 Set of five 'Cinemoid' filters for 382 above .
Ref. 390 Set offive 'Cinemoid' filters for
23F, or 23W. Diameter 12in. (305mm).
Weight 2flb (1 ·1 kg).
400 Ditto for Patt . 23N/ RH. Diameter 17!-in. (445mm).
Weight Sflb (2·Skg).
410 Ditto for Patt. 123. Diameter 17!-in. (445mm).
Weight Sib (2·3kg).
400 or 410 above.
* Suffix - /S as above but 1 RPM instead of 4 RPM
CONTROL BOXES
Control boxes consist of a wall mounting sheet
metal box with the requisite number of rotary
switches, with internal wiring to a terminal block .
Five of the positions of each swit<rh are numbered
1-5 and each selects the corresponding aperture
at the colour-change wheel which rotates until the
chosen colour is brought to rest before the lens of
the spotlight. The sixth position of the switch
marked C provides continuous rotation. A neon
lamp above each switch remains alight while the
motor is in operation. A master switch, permitting
the presetting of individual controls, is fitted on
Control Boxes for 4 ways and above .
Ref. 383 1 way Control Box for 382, 400 or 410 above .
Ref.
384 2 ,.
Ref. 385 4 ,.
Ref. 389 6 ,,
Ref. 386 8 ,,
Ref. 387 12 ,.
Page 6
Patt. 23 & 123
BRACKETS & FIXINGS
BRACKETS
247 Swivel arm wall bracket (reach 10 inches) .
248 Ditto, with
251 Adjustable boomerang bracket for 2-in.
ext ; dia. barrel (reach 10 inches) .
252 Ditto, with extension arm (reach 19 inches) .
195 Adaptor for i-in . bolt as supplied with
brackets 247, 248, 251 and 252 (spare) .
485 Adaptor for 247 and 251 brackets to take two
lanterns, one up and one down .
486 As 485 above but longer to take lanterns side
by side.
238
'L' shaped bracket non-swivelling for two
lanterns , one up and one down .
255 Fixed boomerang bracket for 2-in. ext . dia.
barrel (reach 11 inches).
CLAMP AND SAFETY CHAIN
483 Hook type clamp for 2-in. ext. dia. barrel.
64 Safety chain, 22-in. long, with clip hook .
BASES AND STANDS
extension arm (reach 19 inches) .
1
367 Cast-aluminium ceiling plate or base, 6-in.
dia. (not for wall mounting).
484 Spigot adaptor for i-in . Whit. bolt required
when lantern is used in telescopic stand.
257 Miniature telescopic stand with cable hook
and swivelling collar (min. height 3 ft. 7 in.,
max. height 5 ft . 9 in.) Nett weight 15 lb.
66 Standard telescopic stand with cable hook
and swivelling collar (min. height 4 ft. 3 in.,
max. height 7 ft.) Nett weight 37 lb.
NOTE ON STAGE LIGHTING TRUNNIONS
Patts . 23 and 123 trunnions are now fitted with i-in . Whit .
bolt so that the lanterns can be fixed compactly to the new
483 Hook clamp . Trunnions with the j -in. bolt need a Ref. 484
spigot adaptor when used on any stand . Brackets Ref. 247,
248, 251 and 252 are supplied with a special Ref. 195 adaptor
to enable them to take lanterns with the j-in. bolt .
Also available with BS Studio Spigot. See page 5.
Page
7
PATT. 23, 23F, 23W
359 Spare metal colour frame 4-in. square.
359/C 'Cinemoid' cut to size · for 359 frames.
359/CF Frame with 'Cinemoid'.
376 Hand operated colour wheel.
377 Set of five
for 376 colour wheel.
374 Slatted diffusing glass in metal frame.
310
411
Spare
Spare
'Cine~oid' colours cut to size
31 in. by 5-in. focus H.R. lens.
31-in. by 5-in. focus Fresnel lens .
PATT. 23N
284 Spare metal colour frame 7j-in. square.
284/C 'Cinemoid' cut to size for 284 frames.
284/CF Frame with 'Cinemoid'.
375 Slatted diffusing glass in metal frame.
304 Spare 6-in. by 9-in. focus lens.
PATT. 123, 123W
401 Spare metal colour frame 61-in. square.
401 /C 'Cinemoid / cut to size for 401 frames.
401/CF Frame ,with 'Cinemoid'.
132 Four-door rotatable barndoor shutter.
131 Four-door rotatable barndoor shutter for
404
503
435 Spare
pole operation.
Spare 6-in. short focus Fresnel lens.
Spare 6-in. wide angle Fresnel lens.
4t-in. diameter reflector.
PATT. 123 and 23
493 Spare P.28 lampholder .
PATT. 23 (all types)
357 Spare 7-in. diameter rear reflector.
358 Spare 7-in. diameter front
reflec~or.
PATT. 23 (all types except -/S).
362 Set of four fixed aperture diaphragms.
364 Adjustable straight edge mask.
363 Iris diaphragm.
512 Mica 'Cloud ' Slide.
THE STRAND ELECTRIC
LIGHTING FOR
PATT. 23 CONVERSIONS
Patt. 23 to Patt. 23N. Discard front tube and use:
Ref. 355. Lens tube with lens and colour frame.
Patt. 23 to Patt. 23W . Insert additional:
Ref. 310. Lens 3!-in. diam. by 5-in. focus H.R.
Patt. 23N to Patt. 23. Discard front tube and use:
Ref. 356. Standard tube with lens and colour
frame .
Conversion to built in shutter - /S or to rear
handle - /H types is not possible. These must
be regarded as different models.
& ENGINEERING CO. LTD.
ALL ENTERTAINMENT
Head office & showrooms 29 KING STREET, LONDON, W.C.2. Telephone Temple Bar 4444
and at Manchester, Glasgow, Darlington, Bristol, Dublin, Melbourne and Toronto
104,622,SM Leaflet C40. Printed in England
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