Mole-Richardson 4 kW Baby Softlite (Type 3571)

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Overview
Specifications
Strengths and limitations
Practical uses
Output
Power and controls
Optics and mounting
Alternatives
Coverage
Rental checks
Documentation

Overview

Mole-Richardson 4 kW Baby Softlite, Type 3571

The Type 3571 uses four separately switched 1 kW lamps behind an 18-inch-square opening. At 12 ft, the standard head gives 125 fc across a 16.8 ft field. The Type 3577 intensifier brings the centre to 280 fc and narrows the field to 12 ft.

Mole-Richardson Type 3571 output and field diameter by distance. Performance chart by Mole-Richardson.

Key specifications

Specification	Type 3571
Lamp positions	Four double-ended quartz lamps
Power	4,000 W, 33.3 A at 120 V with four 1 kW lamps
Aperture	18 × 18 in.
Head with cable	34¾ lb
Mount	Removable 1⅛-inch junior pin
Control	Four toggles, one per lamp

Replacement lamps

The catalogue lists the following double-ended lamps. The voltage and wattage are per globe. FCM lamp lookup.

Code	Power	Voltage	Lamp colour	Finish
FCM	1,000 W	120 V	3,200 K	Clear
FHM	1,000 W	120 V	3,200 K	Frosted
EME	800 W	240 V	3,200 K	Clear
EMF	800 W	240 V	3,200 K	Frosted
EJG	750 W	120 V	3,200 K	Clear
EMD	750 W	120 V	3,200 K	Frosted
FDF	500 W	120 V	3,200 K	Clear
FDN	500 W	120 V	3,200 K	Frosted
FCL	500 W	120 V	3,000 K	Clear
FCZ	500 W	120 V	3,000 K	Frosted
EHM	300 W	120 V	2,950 K	Clear
EHZ	300 W	120 V	2,950 K	Frosted

Strengths and limitations

The separate switches let the active lamps run at full voltage as the overall level comes down.
The intensifier concentrates the beam. At 20 ft the extra centre level comes with a reduction in the field diameter from 28 ft to 19.5 ft.

Practical uses

For a two-shot, start with the standard reflector when actors need room to move. If a mark needs more level, compare the narrower intensifier field at that working distance before changing the exposure.

Output and photometrics

Mole measured four FCM 1,000 W, 120 V lamps at 3,200 K. Both configurations use the same four lamps. The field diameter is the width at about half the centre intensity.

Throw	Standard (fc)	Standard field	3577 (fc)	3577 field
4 ft	1,000	5.6 ft	2,400	4.2 ft
8 ft	270	11.2 ft	600	8 ft
12 ft	125	16.8 ft	280	12 ft
16 ft	70	22.4 ft	164	15.7 ft
20 ft	45	28 ft	104	19.5 ft
24 ft	30	33.2 ft	72	23.4 ft
28 ft	25	39 ft	53	27.3 ft

Photometric & exposure calculator

Estimate centre-beam illumination and the corresponding camera aperture from this fixture’s published measurements.

Light configuration Light-to-subject distance

ISO Frame rate (fps) Shutter angle (°) Incident-meter reference

Estimated output

Illuminance—lux

Foot-candles—fc

Approximate f-stop—nearest 1/3 stop

Select a configuration to calculate.

Manufacturer readings are for the stated optic, colour setting and full output, measured at the beam centre. Values between measured distances are interpolated. Point-source values outside those distances are approximate inverse-square estimates; large sources cannot be reliably extrapolated and are limited to their measured range. Exposure uses frame rate, shutter angle, ISO and the selected incident-meter calibration. Only the optics and diffusion explicitly listed in the measurement are included; additional modifiers, bounce, beam edges, ambient light, ND filters and camera exposure-index differences are not accounted for. Confirm critical exposures on set with a meter.

Power and controls

The fixture uses a common supply and four lamp switches. One 1 kW, 120 V FCM draws about 8.3 A. All four draw about 33.3 A together. Mole lists a 3 ft head lead with an MC257G 60 A Bates connector. The selected supply must match the installed lamps.

Optics and mounting

The Type 3575 egg crate limits side spill. Mole also lists a Type 25530 frame and Type 3577 intensifier. The intensifier has its own output table below the specifications.

Comparable fixture

The 4 kW Super-Softlite uses a 36 × 30-inch aperture and weighs 72½ lb with cable. The Baby 4K is lighter and its smaller emitting surface produces a different reflection on glass or polished metal. 4 kW Super-Softlite.

The 2 kW Baby Zip has a narrower aperture and two lamp switches.

Field coverage

Hand Held Films lists its rental head by Type 3571. When requesting a “4K Zip,” specify whether the standard head, egg crate or intensifier is needed. Hand Held Films Type 3571 rental.

Rental and used-fixture checks

Check the four lamps and switches individually. If the rental order calls for the intensifier, confirm Type 3577 is in the case. The egg crate and the intensifier give different fields.

Documentation

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