Abbreviations and terms in lighting design

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BARE BATTEN – fluorescent fixture with bare lamps

BARN DOOR –  flaps, that work as though they were shutters on an ellipsoidal reflector spotlight (read more). See also LOUVER and VISOR

BEAM ANGLE. Inner beam (mostly used in luminaires specsheets) – the solid angle containing all directions of luminous intencities greater than or equal to 50% of the maximum intensity. Outer beam –  the solid angle containing all directions of luminous intencities greater than or equal to 10% of the maximum intensity.

BOM – bill of materials or product structure is a list of the raw materials, sub-assemblies, intermediate assemblies, sub-components, parts and the quantities of each needed to manufacture an end product (read more).

CATWALK – A catwalk is an elevated service platform from which many of the technical functions, such as lighting and sound, may be manipulated.

CFL – Compact fluorescent lamp

CUTOFF ANGLE – the angle, measured from nadir in a given vertical half-plane, between the vertical axis and the line of sight at which all surfaces of high luminance (lamps and of the luminaire) just cease to be visible.

LDC – Light Distribution Curve

LOR – (Light Output Ratio) – the ratio of the light output of a lighting fixture to the total light output of all individual lamps in this luminaire.

LOUVER – square- or circle-shape grid on floodlight which prevent glare effect.

MATERIAL TAKE OFF or TAKE OFF is a term used in engineering and construction, and refers to a list of materials with quantities and types (such as specific grades of steel) that are required to build a designed structure or item (read more).

PA Door – (Personal Access Door) – is a door used by personnel for access and exit from a building.

RCP – (Reflected Ceiling Plan) – A “reflected ceiling plan” shows a view of the room as if looking from above, through the ceiling, at a mirror installed one foot below the ceiling level, which shows the reflected image of the ceiling above. This convention maintains the same orientation of the floor and ceilings plans – looking down from above. Reflected Ceiling Plans or RCP’s are used by designers and architects to demonstrate lighting, visible mechanical features, and ceiling forms as part of the documents provided for construction.

SHIELDING ANGLE – complementary angle of the CUT-OFF ANGLE.

SNOOT (or TOP HAT) – limits the light coming out from floodlight (also referred to as a VISOR)

TROFFER – a troffer is a rectangular light fixture that fits into a modular dropped ceiling grid (read more)

VISOR – used to reduce glare, by reducing cut-off angle (also referred to as a SNOOT or TOP HAT or GLARE SHIELD).


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