1. What is a Watts to Lux Calculator?

Definition: This calculator converts electrical power consumption (watts) to illuminance (lux) based on luminous efficacy and illuminated area.

Purpose: It helps lighting designers, engineers, and homeowners determine the light intensity produced by a light source in a given space.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Lux \) — Illuminance (lumens per square meter)
• \( Watts \) — Electrical power consumption
• \( Efficacy \) — Luminous efficacy (lumens per watt)
• \( Area \) — Illuminated area (square meters)

Explanation: The formula calculates how much light (lux) reaches a surface based on the light source's efficiency and the area being illuminated.

3. Importance of Lux Calculation

Details: Proper lux calculation ensures adequate lighting for tasks, energy efficiency, and compliance with lighting standards for different spaces.

4. Using the Calculator

Tips: Enter the power consumption in watts, luminous efficacy (default 100 lm/W for typical LED), and area in square meters. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical efficacy value?
A: LED bulbs typically range 80-150 lm/W, CFLs 50-70 lm/W, and incandescent bulbs 10-17 lm/W.

Q2: How does area affect lux?
A: Lux decreases as area increases because the same amount of light is spread over a larger surface.

Q3: What's considered good lux levels?
A: Offices need 300-500 lux, retail spaces 500-1000 lux, and precision work may require 1000-2000 lux.

Q4: Does this account for light loss?
A: No, for more accuracy, consider adding a light loss factor (typically 0.7-0.9) to the formula.

Q5: Can I use this for outdoor lighting?
A: Yes, but remember outdoor calculations often need to account for greater distances and environmental factors.