Mole-Richardson Four-Light Molefay (Type 5581)

Last Updated 3 hours ago

Overview

Type 5581 four-light Molefay with pivoting lamp modules

The 2,600 W Four-Light Molefay arranges four PAR36 lamps in two pivoting columns. At 15 ft with FAY daylight spots, narrowing the bank raises the centre from 325 to 595 fc and cuts its width from 13.5 to 6.6 ft.

Key specifications

SpecificationDetails
Head rating2,600 W maximum
Supply and full-load current120 V AC or DC, 21.7 A maximum
Lamp contactsSpring-loaded ferrule contacts
SwitchesFour head-mounted switches, one per lamp
MountRemovable 1⅛ in. pin with a ⅝ in. receiver
Body dimensions14 × 11 × 4⅜ in.
Weight16¾ lb with cable

Replacement lamps

PAR36 lampRated power and voltageColour and beamRated life
FAY650 W, 120 VDichroic daylight spot30 h
FCX650 W, 120 V3,200 K medium100 h
FCW650 W, 120 V3,200 K wide100 h

Look up the individual lamp codes for FAY, FCX, FCW.

Strengths and limitations

  • Each lamp has a switch. The two columns give control over the horizontal overlap while keeping the head compact.
  • At full output the published draw is 21.7 A at 120 V. That exceeds a 20 A circuit even though the product page describes the original lead as having a house plug.

Practical uses

For a bounce beside a window, use the beam dimensions to choose how much of the bounce the lamps will fill. At 10 ft with FCX medium floods, the wide setting lights 12.5 × 5.1 ft at 580 fc. Bringing the columns together gives 6.7 × 4.6 ft at 1,040 fc.

Output and photometrics

Centre-beam output in foot-candles with 650 W, 120 V lamps. All lamps are on. Maximum and minimum refer to the width of the field as the modules pivot. In the original chart, the field boundary is where the intensity falls to roughly half the centre reading.

Lamp and beam setting5 ft10 ft15 ft20 ft30 ft40 ft50 ft
FAY daylight spot · maximum width2,700730325185804530
FAY daylight spot · minimum width5,1201,3405953351508555
FCX tungsten medium · maximum width2,030580260145653525
FCX tungsten medium · minimum width4,0001,0404602601156540
FCW tungsten wide · maximum width89023010060251510
FCW tungsten wide · minimum width1,630420190105452515

Original manufacturer chart with beam width and height.

Photometric & exposure calculator

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

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 head has a 25 ft lead and four switches. Have the supplying electrician confirm the fitted connector, cable and circuit rating for the intended load before using all four lamps.

Optics and mounting

Type 55841 shields and holder, Type 5584 diffuser frame. Each lamp has its own Type 55416 retainer. Confirm that the frame comes with the matching holders.

Comparable fixture

The Nine-Light has three columns and a different beam chart. Nine-Light Molefay (Type 5541).

Field coverage and further reading

B&H’s archived listing gives 325 fc over 13.5 × 5 ft at 15 ft. The manufacturer chart identifies the setup behind that figure as FAY spots at maximum beam width. B&H Type 5581 listing.

Rental and used-fixture checks

Check the removable pin, all four retainers and the holder that takes the 5584 frame. Specify daylight FAY or the desired tungsten spread on the order.

Documentation

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