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Lighting Installation Guide
WHAT’S INSIDE
01
The Four Sizing Formulas.
Almost every sizing question comes down to one of four shortcuts. Run in order: diameter, body height, hanging height, then spacing for multiples.
Fixture Diameter
The single rule that matters most. Take the room’s length and width in feet, add the two numbers, and read the answer as inches — that’s your ideal fixture diameter, applied to chandeliers, pendants, flush, and semi-flush.
Try it: a 12 × 14 ft room adds to 26 — so a 26-inch fixture sizes correctly.
Fixture Height
Body height is what makes a fixture feel proportionate to a room. Take your ceiling height in feet, multiply by 2.5 to 3 — that’s the ideal vertical span in inches. Anything shorter starts to look stubby; anything taller begins to dominate.
A 10-ft ceiling calls for 25 to 30 inches tall.
Hanging Height Above a Surface
Pendants over a dining table or kitchen island live in a narrow zone — high enough to keep sightlines clear across the surface, low enough to deliver real task light onto it.
Measured from the lowest point of the fixture to the surface. Same window for dining tables and counters.
Multiple Pendants
Lining up two or three over a long surface? Size each to the surface, not the room. Space evenly with at least 6 inches at each end.
Each ≈ ¼ of length
On a 72-inch table:Â ~18-inch pendants, evenly distributed.
02
Read the Ceiling First.
Before any formula, the ceiling height tells you what kind of fixture the room can carry — the type, the cord length, and whether a chandelier overhead will feel gracious or oppressive.
Stay Close.
Stay close to the ceiling line. Flush and semi-flush mounts protect the headroom that already isn’t there. Skip anything with a long drop — it visually compresses the room.
The Sweet Spot.
Forgiving range for most decorative fixtures. Keep the lowest point at or above 7 ft.
Go Vertical.
Treat the height as the room’s gift. Oversized chandeliers, long-drop pendants, or sculptural clusters use the vertical space lower ceilings can’t.
A reliable rule of thumb —
every foot of ceiling supports 2.5 to 3 inches of fixture body.
A 12-foot room comfortably carries a chandelier between 30 and 36 inches tall.
| CEILING | FIXTURE TYPE | MIN FLOOR CLEARANCE | NOTES |
|---|---|---|---|
| 8 ft — Low | Flush / Semi-flush | 7 ft | Short cord, skip heavy downlights |
| 9 to 10 ft — Standard | Pendant / Chandelier | 7 ft | The default range for most stocked fixtures |
| 10 to 12 ft | Larger chandeliers | 7.5 ft | Order extra cord; lean to taller silhouettes |
| 12 ft & Above | Oversized / Cluster | 8 ft | Clusters or oversized statement chandeliers |
| Vaulted / Sloped | Any (check canopy) | 7 ft min | Most Mooiehome pendants include sloped-ceiling canopies |