Lighting Simulation — Master Technical Guide

Introduction

Lighting simulation is the bridge between design intent and real-world performance. Before any luminaire is installed, simulation tools such as DIALux EVO or AGi32 can accurately predict how light will distribute across roads, parking areas, plazas, and sports fields. A professional simulation ensures your project meets international standards, avoids overlighting, and achieves both safety and efficiency.

At Sunlurio, we use advanced photometric data (IES / LDT files), precise 3D site modeling, and realistic surface reflectance values to visualize every detail — from uniformity on roadways to spill-light control near residential areas. The result: a design that performs as beautifully as it looks on paper.

Why Lighting Simulation Matters

• Predicts real-world illumination levels before installation.
• Ensures compliance with EN 13201, IES RP-8, and local standards.
• Optimizes luminaire placement, height, and optics for uniformity.
• Reduces cost by avoiding unnecessary fixtures or overdesign.
• Verifies glare control, cutoff, and sky-glow compliance.

Design Process Overview

1. Define the lighting area: Import site plan (DWG, DXF, or Google Earth image) and mark boundaries for roads, parking bays, and walkways.
2. Set parameters: Specify mounting height, pole spacing, arm outreach, tilt, CCT, CRI, and luminaire distribution type (Type II–V).
3. Assign surfaces: Apply reflectances — asphalt (0.08–0.15), concrete (0.25–0.35), vegetation (0.10–0.20).
4. Insert photometry: Load IES or LDT files from Sunlurio’s database to match real product optics.
5. Run calculation: Generate isolux contours, 3D visualization, false-color maps, and UGR (glare) results.
6. Validate: Compare with standard requirements (average lux, uniformity, TI%, etc.).

Key Simulation Standards

Application	Standard	Average Lux	Uniformity (Min/Avg)	Threshold Increment (TI)
Urban Road (ME3a)	EN 13201	15 lx	≥0.40	≤10%
Residential Street (S2)	EN 13201	7.5 lx	≥0.40	≤15%
Parking Lot	IES RP-8	10–20 lx	≥0.25	≤20%
Pedestrian Walkway	IES RP-33	5–10 lx	≥0.25	—
High Mast Area	EN 12193	30–50 lx	≥0.50	≤10%

Input Parameters for Accurate Simulation

• Mounting height: 6–12 m for roads, 4–8 m for parking, up to 30 m for high mast.
• Tilt angle: 0–10° depending on optic type and road width.
• Pole setback: Typically 0.5–1.5 m from pavement edge.
• Arm outreach: 0.75–1.5 m (balance of coverage vs glare).
• Surface reflectance: Determines contrast and perceived brightness.
• Road classification: ME, CE, or S categories define illuminance and uniformity targets.

Interpreting Simulation Results

Lighting simulation outputs include several maps and charts that guide design optimization:

• Isolux contour map: Shows lines of equal illuminance (lx) on the ground.
• False-color diagram: Visualizes brightness levels for instant uniformity check.
• 3D render view: Helps evaluate visual comfort, contrast, and brightness perception.
• Glare rating (UGR or TI): Quantifies discomfort from bright sources.
• Energy density chart: Shows power consumption per area (W/m²).

Common Design Optimization Techniques

1. Increase mounting height to improve uniformity, not brightness.
2. Use asymmetric optics for wide roads to minimize backlight waste.
3. Reduce pole count with double-arm layout for median installation.
4. Adjust tilt angle to balance longitudinal uniformity and glare.
5. Select warm CCT (3000–4000K) for residential and ecological zones.

Advanced Simulation Parameters

Maintenance Factor (MF): typically 0.75–0.85.
MF = LLMF × LSF × LMF × RSMF, where:
LLMF = Lamp Lumen Maintenance Factor, LSF = Lamp Survival Factor, LMF = Luminaire Maintenance Factor, RSMF = Room Surface Maintenance Factor.

Road Width Ratio (RWR): RWR = Road Width / Mounting Height.
Design range: 1.2–1.8 for urban roads, 0.8–1.3 for residential streets.

Standard Comparison Summary

Region	Standard	Average Lux	Uniformity	Glare Index
EU	EN 13201 ME3a	15 lx	≥0.40	TI ≤10%
US	IES RP-8 Collector Road	13 lx	≥0.35	Veiling ≤0.3
China	GB/T 9468-2008 A2	20 lx	≥0.35	GR ≤45

Simulation Accuracy and Field Verification

According to Sunlurio field audits (2024–2025), DIALux EVO predictions differ by less than ±8% from measured results when input photometry and surface reflectances are accurate. This validation ensures that simulation-based design remains a reliable engineering basis for government tenders and EPC projects.

Case Study: Solar Street Lighting Simulation

Project: 8 m solar street lights for a residential community, East Africa.
Setup: 40 W LED @ 8 m height, Type II optic, 25 m spacing, 3000 K.
Result: Avg 8.6 lx, Min 2.8 lx, Uniformity 0.33, TI = 11%, compliant with EN 13201 S2.
Energy savings: 100% off-grid operation, MPPT controller, LiFePO₄ battery.
Conclusion: Optimized with 6° tilt and single-arm layout for improved uniformity across pavement center.

Sunlurio Simulation Advantages

• All calculations performed with verified photometry (IES / ULD files).
• Multi-standard compliance: EN 13201, IES RP-8, CIE 115 validated templates.
• Custom reporting: Add your logo, project name, and tender-ready charts.
• Smart integration: Pair simulation results with Sunlurio smart lighting control systems.
• Fast turnaround: 24–48 h delivery for standard road or parking layout.

Author Introduction

Written by the Sunlurio Lighting Engineering Team — specialists in outdoor and solar lighting design. We provide full DIALux EVO simulations, IES files, mounting layouts, and energy reports to ensure every project meets international standards. For custom lighting simulations, send us your drawings and parameters — we’ll help you visualize light before it touches the ground.