Inputs

Room length m Enter a numeric project value in m at or above 0.01. Room width m Enter a numeric project value in m at or above 0.01. Luminaire mounting height m Enter a numeric project value in m at or above 0. Task plane height m Enter a numeric project value in m at or above 0. Ceiling reflectance % Enter a numeric project value in % between 0 and 100. Wall reflectance % Enter a numeric project value in % between 0 and 100. Floor reflectance % Enter a numeric project value in % between 0 and 100.

Room index --

Weighted reflectance -- %

Reflectance profile --

UF guidance --

Calculation details

Room index: --
Weighted reflectance: -- %
Reflectance profile: --
UF guidance: --

Important notes

Reflectance assumptions affect UF and lighting estimates; verify finishes and product photometry before design decisions.
This tool records assumptions only and does not declare compliance.

Formulas

\(\displaystyle K = \frac{L \times W}{H_m(L+W)}\)
\(\displaystyle R_w = 0.5R_c + 0.3R_w + 0.2R_f\)

Summarise room index and a weighted reflectance profile from ceiling, wall, floor, and geometry assumptions.

Room Reflectance Assumption Tool 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.

Inputs

Results

Formulas

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