1. What is Illumination (Illuminance)?

Definition: Illumination measures the amount of luminous flux falling on a surface area, expressed in lux (lx).

Purpose: It helps lighting designers, architects, and engineers determine appropriate lighting levels for spaces.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( E \) — Illumination (lux)
• \( \Phi \) — Luminous flux (lumens)
• \( A \) — Area (square meters)

Explanation: The total luminous flux is divided by the area it illuminates to determine the illumination level.

3. Importance of Illumination Calculation

Details: Proper illumination calculations ensure adequate lighting for tasks, energy efficiency, and compliance with building codes.

4. Using the Calculator

Tips: Enter the luminous flux in lumens (typically found in lamp specifications) and the area in square meters. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical illumination level for offices?
A: Most offices require 300-500 lux for general work areas.

Q2: How does illumination differ from luminance?
A: Illumination measures light falling on a surface (lux), while luminance measures light reflected from a surface (cd/m²).

Q3: What's the difference between lumens and lux?
A: Lumens measure total light output (flux), while lux measures light per unit area (illuminance).

Q4: How do I find the luminous flux of a light source?
A: Check the product specifications - it's usually listed in lumens (lm) on the packaging.

Q5: What illumination level is recommended for reading?
A: Reading typically requires 300-500 lux, while detailed work may need 750-1000 lux.