Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

IEC

Linear fluorescent luminaire plan mark

Linear fluorescent luminaires are drawn on IEC-style plans as a straight line with a short perpendicular bar at each end, laid out at the length and orientation of the actual fitting. The same form is widely reused for linear LED battens.

Drawing use: GA
Application: Installation & communications
Reference family: IEC
Form evidence: Fluorescent lamp luminaire. IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier.

A distinction that matters

A multi-tube fitting shows parallel lines; this form shows a single tube or a generic linear fitting.

Full reference

LF3

IEC

Multi-tube fluorescent luminaire plan mark

Multi-lamp linear luminaires, such as twin or triple tube troffers, are drawn with parallel lines between end bars, one line per lamp. Alternatively a single line with a numeral is used. The form helps lighting designers check that luminaire output matches the calculation.

Drawing use: GA
Application: Installation & communications
Reference family: IEC
Form evidence: Multi-lamp fluorescent luminaire. IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier.

A distinction that matters

The single-line form shows one lamp; parallel lines show multi-lamp fittings.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.