3 x 3 m at 300 lx

Average centres: 1.0 mBeam diameter: 2.4 m

4 x 4 m at 300 lx

Average centres: 1.2 mBeam diameter: 2.4 m

5 x 4 m at 300 lx

Average centres: 1.3 mBeam diameter: 2.4 m

6 x 4 m at 200 lx

Average centres: 1.5 mBeam diameter: 2.8 m

6 x 5 m at 300 lx

Average centres: 1.3 mBeam diameter: 4.8 m

Table PDFDownlight Spacing Chart

Download the table with the page URL and retrieval date for offline lighting checks.

Room and target	Assumptions	Formula result	Boundary
3 x 3 m at 300 lx	Floor or bench-zone estimate using 600 lm each, UF 0.70, MF 0.80; 2.1 m effective height, 60 degree beam.	9 fittings; about 1.0 m average centres; 2.4 m beam diameter.	Transfer this to the calculator before marking actual set-out and edge distances.
4 x 4 m at 300 lx	General room take-off using 800 lm each, UF 0.70, MF 0.80; 2.1 m effective height, 60 degree beam.	11 fittings; about 1.2 m average centres; 2.4 m beam diameter.	Task zones, glare views, beams and ceiling constraints still need separate records.
5 x 4 m at 300 lx	Larger room estimate using 900 lm each, UF 0.70, MF 0.80; 2.1 m effective height, 60 degree beam.	12 fittings; about 1.3 m average centres; 2.4 m beam diameter.	A real grid may round up or shift rows for symmetry, furniture and task coverage.
6 x 4 m at 200 lx	Lower ambient target using 900 lm each, UF 0.70, MF 0.80; 2.4 m effective height, 60 degree beam.	10 fittings; about 1.5 m average centres; 2.8 m beam diameter.	Changing target lux changes count; effective height and beam angle own the geometry.
6 x 5 m at 300 lx	Wide-room estimate using 1,000 lm each, UF 0.70, MF 0.80; 2.4 m effective height, 90 degree beam.	17 fittings; about 1.3 m average centres; 4.8 m beam diameter.	Wide beams still need uniformity, glare and wall-edge checks before layout use.

Related pages