Inputs
Results
Target-plane diameter
--
m
Target-plane radius
--
m
Target-plane area
--
m2
Calculation details
- Target-plane diameter
- -- m
- Target-plane radius
- -- m
- Target-plane area
- -- m2
Important notes
- Confirm whether the product data uses full beam angle, half-peak angle, or another definition.
- Australian standards may inform the planning boundary; no automatic compliance statement is made.
Formulas
- \(\displaystyle D = 2h\tan(\theta/2)\)
- \(\displaystyle A = \pi(D/2)^2\)
- The result is a geometric estimate and does not certify illuminance.
Calculate the geometric beam diameter at a selected work or wall plane.
Beam Diameter at Target Plane is a planning aid. Keep the target source, product data, measurement method, and project assumptions with the result. Confirm compliance, installation, certification, and safety decisions with the responsible professional.