Last Updated 57 minutes ago
Overview
The Type 7391 is a circular bank of six PAR64 lamps behind a silk skirt and bottom target. It takes the same fabrics as Mole’s 6 kW Type 7291 Spacelite, but the PAR lamps concentrate more light beneath the head. With six 1 kW FFR medium floods, Mole lists 131 fc directly below at 15 ft and 28 fc parallel to the head at the same chart distance.
Key specifications
| Specification | Type 7391 |
|---|---|
| Lamphead | Six PAR64 lamps, extended mogul end-prong sockets |
| Full load at 120 V | 6,000 W / 50 A or 7,200 W / 60 A, depending on the installed lamps |
| Head rating | 120/240 V AC or DC, 7,200 W maximum |
| Mount | Steel yoke with removable 1⅛-inch junior pin and integral hanger |
| Weights | 23 lb bare, 35 lb with lamps, 42 lb with lamps, white silk and target, 54 lb with the full black skirt added |
Replacement lamps
The globe table lists 1 kW tungsten and dichroic daylight PAR64s and 1.2 kW tungsten PAR64s. FFR medium-flood lamp reference.
| Code | Per lamp | Voltage | Colour | Beam |
|---|---|---|---|---|
| FFN | 1,000 W | 120 V | 3,200 K | Very narrow spot |
| FFP | 1,000 W | 120 V | 3,200 K | Narrow spot |
| FFR | 1,000 W | 120 V | 3,200 K | Medium flood |
| FFS | 1,000 W | 120 V | 3,200 K | Wide flood |
| FGM | 1,000 W | 120 V | Dichroic daylight | Narrow spot |
| FGN | 1,000 W | 120 V | Dichroic daylight | Medium flood |
| GFC | 1,200 W | 120 V | 3,200 K | Very narrow spot |
| GFB | 1,200 W | 120 V | 3,200 K | Narrow spot |
| GFA | 1,200 W | 120 V | 3,200 K | Medium flood |
Strengths and limitations
- PAR64 beam choice changes the balance below and beside the head. At 15 ft a set of FFN lamps gives 217 fc below and 24 fc parallel to the head. A set of FFS wide floods gives 85 and 26 fc respectively.
- A black skirt helps keep side spill off a backing. The side and 45° figures in Mole’s table were measured with the white silk exposed.
Practical uses
Over a stage floor, use the vertical figures for a mark beneath the source. For action beside it, check the 45° or parallel reading as well. With FFR lamps the difference between the centre and side readings at 15 ft is more than two stops.
Output and photometrics
Mole measured three directions with the white silk and bottom target installed. The sheet says adding the full black skirt leaves the vertical readings unchanged. The chart gives five throws for each lamp. The table below shows one throw across all three directions.
| Lamp at 15 ft | Below (fc) | 45° (fc) | Parallel (fc) | Vertical field diameter |
|---|---|---|---|---|
| FFN | 217 | 39 | 24 | 6 ft |
| FFP | 200 | 46 | 27 | 6 ft |
| FFR | 131 | 44 | 28 | 10.8 ft |
| FFS | 85 | 40 | 26 | 14 ft |
| GFC | 293 | 53 | 27 | 4.5 ft |
| GFB | 236 | 43 | 25 | 4.5 ft |
| GFA | 159 | 44 | 28 | 10 ft |
For GFC at 30 ft, Mole prints 43 fc directly below. That is a larger drop from the 25 ft reading than the neighbouring rows suggest. The calculator carries the printed value. Meter a critical setup at that distance.
Photometric & exposure calculator
Estimate centre-beam illumination and the corresponding camera aperture from this fixture’s published measurements.
Estimated output
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. Photometric source
Power and controls
With six 120 V lamps the nominal load is 8.3 A per 1 kW lamp or 10 A per 1.2 kW lamp. Confirm the head connector and breakout at prep. An adapter that groups the feeds changes which lamps the board operator can control together.
Modifiers and mounting
Mole lists the Type 72936 white silk, 72937 bottom target and 72935 full black skirt. The half black skirt is Type 72977. A 29-inch rigid skirt, Type 73947, is a separate accessory.
Comparable fixture
The 6 kW Type 7291 uses double-ended quartz lamps with the same skirt family. Its black-skirt chart gives 28 fc at 15 ft. This Type 7391 gives 131 fc directly below at that distance with 1 kW FFR PARs. 6 kW Type 7291 Spacelite.
For a rectangular six-PAR64 unit with diffusion in a frame, see the Type 7251 MaxiCoop.
Field coverage
Mole’s rental catalogue distinguishes packages with 1 kW and 1.2 kW lamps. For the often-quoted 131 fc at 15 ft, the fixture sheet identifies the test lamp as the 1 kW FFR. Mole-Richardson rental catalogue.
Rental and used-fixture checks
Book the lamp code as well as the head. Six FFRs and six GFA lamps are both medium floods, but the full sets draw 50 A and 60 A respectively at 120 V. Check the fabrics against the 7291 accessory numbers.
Documentation
- Manufacturer’s fixture specifications and document listing
- Read the original two-page lamp and output sheet
- Mole-Richardson equipment catalogue, overhead fixtures
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