FC Around & Find Out
or......Angled Photometrics Jawn
Define the job by a known focal distance or by the coverage perimeter you actually need to light. Every photometric mode uses the same derived throw and aim.
Named scenarios
Saved scenarios include every input, override, unit choice, and imported IES profile. Exported .fcfo files are portable.
No scenario selected.
Fixture data
Use the published center-beam FC from a known throw. Beam angle is the full angle, not the half-angle.
FC
FT
DEG
Zoom calibration
Two published or measured center-beam readings. The throws may be different; the app normalizes them.
Point A narrower or wider is fine
DEG
FC
FT
Point C same fixture and output mode
DEG
FC
FT
DEG
Enter two calibration points to estimate output.
IES photometry
The file is read in this browser. Type C LM-63 files with TILT=NONE are supported in this version.
DEG
Optional IES zoom estimate choose matching color/output modes
DEG
DEG
DEG
Enter the measured zoom for Profile A and Profile C.
DEG
Choose one IES file—or several files for different zooms and color modes.
Linear overlap
Choose which valid calculation supplies the footprint and intensity. The row is treated as repeating, so weaker end fixtures do not distort the average.
Calculate a source to make it available.
%
FIX
Requested overlap is maintained; total coverage may expand beyond or fall short of the selected Job Geometry axis.
Average illuminance is calculated over one repeating center-to-center bay. Physical fixture spacing and focal-point spacing are equal because every fixture retains the same tilt and orientation.
Mirrored full coverage
Two mirrored fixture rows aim inward from opposite perimeter sides. In Coverage Area mode, quantity per side is solved from the requested along-row overlap.
Calculate a source to make it available.
DEG
Uses the selected source’s current height and aim.
FIX
Enter a fixed quantity, or use Coverage Area to solve it.
%
%
FT
FT
Fixture rows run across the aiming direction, using oval width along each row and oval length between the opposing rows.
Job geometry
All heights use the same zero. Coverage Area derives the horizontal focus distance from the perimeter, fixture-row offset, and aim depth.
FT
FT
FT
FT
FT
FT
FT
FT
FC
%
The target evaluates sampled Overlap and Full Coverage areas. The output factor applies to every source, including imported IES data.
200.0′ × 85.0′ coverage · rows along X · calculating derived aim…
Actual throw
—
diagonal distance
Aim angle
—
from straight down
Center illuminance at throw
—
plane perpendicular to beam
Illuminance on focal plane
—
includes cosine loss
Beam footprint at focal height
Top view of the exact cone intersection with the horizontal plane.
aimed focal point
oval center
Target
—
Area meeting target
—
Compliant area
—
Below-target area
—
Finite-row coverage layout
Nominal 50% footprints, overlap, and dimensioned coverage for the entered fixture quantity.
Oval length
—
Oval width
—
Near edge from plumb
—
Far edge from plumb
—
What the two illuminance numbers mean: published center-beam output is normally measured on a surface perpendicular to the beam. “Illuminance on focal plane” applies the incidence-angle cosine for the horizontal plane you entered. This is clean geometric photometry—not an IES calculation—and does not model field angle, beam-edge falloff, lens distortion, shutters, or atmospheric loss.