1. What is Lumens to Wattage Calculation?

The Lumens to Wattage calculation helps determine the power consumption (wattage) of a light source based on its brightness (lumens) and efficiency (luminous efficacy). This is useful for comparing different lighting technologies and estimating energy costs.

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

• \( Lumens \) — Total luminous flux (brightness)
• \( Lumens\ per\ Watt \) — Luminous efficacy (efficiency)

Explanation: The equation divides the total light output (lumens) by the efficiency (lumens per watt) to determine the actual power consumption in watts.

3. Importance of Wattage Calculation

Details: Understanding the relationship between lumens and wattage helps in selecting energy-efficient lighting solutions and estimating electricity costs for lighting systems.

4. Using the Calculator

Tips: Enter lumens (brightness) and luminous efficacy (efficiency) values. Both values must be positive numbers. Typical efficacy values range from 10-20 lm/W for incandescent bulbs to 80-100 lm/W for LED bulbs.

5. Frequently Asked Questions (FAQ)

Q1: What are lumens?
A: Lumens measure the total amount of visible light emitted by a source (brightness). Higher lumens mean brighter light.

Q2: What is luminous efficacy?
A: Luminous efficacy (lm/W) measures how efficiently a light source converts power (watts) into light (lumens).

Q3: What are typical efficacy values?
A: Incandescent: 10-20 lm/W, CFL: 50-70 lm/W, LED: 80-100+ lm/W. Check manufacturer specifications for exact values.

Q4: Why calculate wattage from lumens?
A: Helps compare energy efficiency of different bulbs with the same brightness and estimate electricity costs.

Q5: Can I use this for all light types?
A: Yes, as long as you know the lumens and efficacy values. Different bulb types will have different efficacy values.