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Free workspace lighting lux calculator. Estimate illuminance (lux) from room area, total lumens, task type, and daylight — then compare to 300–500, 500–750, or 750–1000 lux targets. Then tune screens with the screen brightness eye strain calculator.
Last updated: May 24, 2026
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Estimated Lighting Level
420 lux
Recommended Range
300 - 500 lux
Lighting Risk Level
Low
Lighting is within the recommended range for this task profile.
Use this as a planning tool and validate with on-site lux measurements when available.
We can build and embed a custom version of Workspace Lighting Lux Calculator for your brand and workflow.
Answers: how many lux for office work, lumens needed for 500 lux, and whether lighting is too dim or too bright for your task.
Rounded illuminance for quick planning at the workspace.
300–500, 500–750, or 750–1000 lux bands by task profile.
How far estimated lux sits from the recommended band.
Default: 12 m² · 4,500 lm · general office · medium daylight → base 375 lux × 1.12 = 420 lux · target 300–500 · Low risk.
Estimated Lux
420 lux
Target Range
300–500 lux
Risk Level
Low
| Task | Lux range | Typical use | Note |
|---|---|---|---|
| General office work | 300–500 lux | Computer, email, meetings | Common open-plan target |
| Detailed reading/writing | 500–750 lux | Paper review, markup, spreadsheets | Add desk task lamp if low |
| Design/precision tasks | 750–1000 lux | Color proofing, fine assembly | Localized high-CRI lighting |
| Level | Multiplier | When to use | Example (4,500 lm / 12 m²) |
|---|---|---|---|
| Low | ×1.00 | Interior office, blinds closed, evening | 4,500 lm ÷ 12 m² = 375 → 375 lux |
| Medium | ×1.12 | Typical window + ceiling mix | 375 × 1.12 = 420 lux |
| High | ×1.25 | Large windows, skylights, perimeter desk | 375 × 1.25 = 469 lux |
| Condition | Level | Action |
|---|---|---|
| deltaBelow > 150 lux | High | Far under target — add lumens or task lights |
| deltaAbove > 250 lux | High | Far over target — dim, diffuse, or shade |
| deltaBelow 61–150 OR deltaAbove 121–250 | Moderate | Near edge — fine-tune |
| Otherwise | Low | Within practical band for task profile |
Lux measures luminous flux per unit area (lm/m²). This calculator uses a simplified room-average model — for compliance or critical visual tasks, measure at the work surface.
estimatedLux = round((totalLumens ÷ roomAreaSqM) × daylightMultiplier)daylightMultiplier = 1.00 (low) | 1.12 (medium) | 1.25 (high)risk = High if (min − lux) > 150 or (lux − max) > 250; Moderate if > 60 or > 120; else Low420 lux · target 300–500 · Low — Lighting is within the recommended range for this task profile.
420 lux vs 500–750 · Moderate (80 lux below minimum) — add task lighting.
1000 lux · target 750–1000 · Low.
100 lux vs 300–500 · High (200 lux below minimum).
1042 lux vs 300–500 · High (542 lux above maximum) — reduce glare and screen brightness.
448 lux · Low for general office tasks.
650 lux vs 750–1000 · Moderate (100 lux below minimum).
747 lux vs 300–500 · Moderate (247 lux above maximum).
Share with facilities teams, architects, and remote workers sizing home office lighting.
Suggested hashtags: #Lighting #Ergonomics #OfficeDesign #VisualComfort #Lux