1. What is Lux to Watts Conversion?

The Lux to Watts conversion calculates the electrical power (watts) needed to achieve a certain illuminance level (lux) over a specific area, given the luminous efficacy of the light source. This is useful for lighting design and energy efficiency calculations.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Lux \) — Illuminance in lux (lumens per square meter)
• \( Area \) — Area in square meters
• \( Efficacy \) — Luminous efficacy in lumens per watt (lm/W)

Explanation: The formula converts illuminance (lux) to power (watts) by accounting for the area being illuminated and the efficiency of the light source.

3. Importance of Lux to Watts Conversion

Details: This conversion helps in designing lighting systems, estimating energy requirements, and comparing the efficiency of different lighting solutions.

4. Using the Calculator

Tips: Enter illuminance in lux, area in square meters, and luminous efficacy in lumens per watt. Typical efficacy values: 10-20 lm/W for incandescent, 50-100 lm/W for fluorescent, 80-120 lm/W for LED.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between lux and lumens?
A: Lumens measure total light output, while lux measures illuminance (lumens per square meter).

Q2: What are typical lux requirements?
A: Offices need 300-500 lux, workshops 750-1000 lux, precision work 1500-2000 lux.

Q3: How does efficacy affect the calculation?
A: Higher efficacy means less power is needed to achieve the same illuminance, making the lighting more energy efficient.

Q4: Can I use this for outdoor lighting?
A: Yes, but outdoor calculations should also account for light loss factors and maintenance factors.

Q5: Why is my result different from the bulb's wattage?
A: Actual bulb wattage may differ due to manufacturer specifications, driver losses, or operating conditions.