Technical meaning
- Mounting height is the vertical position of the light-emitting point or luminaire reference used in the estimate.
- For recessed downlights it may be close to ceiling height, while high-bay or floodlight mounting can sit much higher.
Mounting height and workplane heightBeam and lux geometry should name the assessed plane before using height in a calculation.Calculation use
- Beam diameter uses the difference between mounting height and workplane height.
- Warehouse and downlight estimates also use mounting height to interpret spacing, beam footprint and practical coverage.
Not the same as
- Mounting height is not the same as ceiling height in every situation.
- Mounting height does not prove lux, glare or uniformity without output and distribution information.
Australian context
- Australian room and warehouse notes should note mounting height beside beam angle, target plane and fitting output.
Examples
| Example | Value | Planning note |
|---|
| Residential ceiling | 2.4 m mounting height | Often used for downlight geometry before set-out checks. |
|---|
| Warehouse high-bay | 6 m or more | Beam footprint grows with effective height but output and glare remain separate. |
|---|
| Outdoor floodlight | varies by bracket or pole | Aiming and spill-light risk sit beside the height input. |
|---|
Calculation limits and records
- Mounting-height geometry is preliminary. Final locations, supports, electrical work and aiming notes require project-specific checks.