SmartArch Engineering Tool

SmartArch Lighting / Daylight / Material Reflection Calculator

Term note: E_avg, U0 and UGR are lighting design indicators. ρ, τ, α, gloss and solar reflectance support preliminary material, glare and energy checks only.

Project data

Project name

Local code / standard reference

Authority / municipality / AHJ

Building use

Room name

Room type

Room area A (m²)

Length (m)

Width (m)

Height (m)

Working plane height (m)

Occupant load

Artificial lighting

Target illuminance E_target (lux)

Minimum illuminance E_min (lux)

Luminaire luminous flux Φ (lm)

Luminaire count N

Luminaire power (W)

CU - utilization factor

MF - maintenance factor

Annual operation hours

Control factor

Required uniformity U0

Maximum UGR limit

Calculated / entered UGR

Emergency lighting required

Emergency duration provided (min)

Daylighting

Window / glass area (m²)

Visible transmittance VT

Indoor daylight Ei (lux)

Outdoor illuminance Eo (lux)

sDA (%)

UDI useful (%)

ASE (%)

DGP / daylight glare probability

Daylight / sunlight report required

Material reflection

Ceiling area (m²)

Ceiling reflectance ρ

Wall area (m²)

Wall reflectance ρ

Floor area (m²)

Floor reflectance ρ

Material visible reflectance ρv

Material solar reflectance SR

Material transmittance τ

Gloss 20°

Gloss 60°

Gloss 85°

Neighbour glare target exists Road / driver glare target exists

Results

Legal / technical use notice:
Preliminary only; province/municipality/permit authority verification required.
Local code / standard reference — Missing

Calculate

Term note: E_avg, U0 and UGR are lighting design indicators. ρ, τ, α, gloss and solar reflectance support preliminary material, glare and energy checks only.

Formulas: E_avg=(N×Φ×CU×MF)/A; U0=E_min/E_avg; DF=Ei/Eo×100; ρ_avg=Σ(Aᵢ×ρᵢ)/ΣAᵢ; ρ+τ+α=1; R=D−2(D·N)N.
Daylight values are preliminary indicators; full EN 17037 / climate-based compliance requires project-specific simulation and expert review.