1. What is Lumens to Watts Conversion?

The Lumens to Watts conversion helps determine the power consumption (watts) of a light source based on its brightness (lumens) and efficiency (lumens per watt). This is particularly useful when comparing different lighting technologies or calculating energy usage.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( W \) — Power consumption in watts
• \( \text{Lumens} \) — Total light output (brightness)
• \( \text{Lumens per Watt} \) — Light efficacy (efficiency)

Explanation: The formula divides the total light output by the efficiency to determine the required power input.

3. Importance of Light Efficiency

Details: Light efficacy measures how efficiently a light source converts electricity into visible light. Higher efficacy means more light with less energy. Modern LEDs typically range from 80-120 lumens per watt, while incandescent bulbs are only about 10-17 lumens per watt.

4. Using the Calculator

Tips: Enter the total lumens (brightness) of your light source and its efficacy in lumens per watt. Typical LED efficacy is 80-120 lm/W. The calculator will show the equivalent power consumption in watts.

5. Frequently Asked Questions (FAQ)

Q1: Why convert lumens to watts?
A: Converting helps compare energy efficiency between different light sources and estimate electricity costs.

Q2: What's a good lumens per watt ratio?
A: For LEDs, 80-120 lm/W is excellent. Higher numbers indicate more efficient lighting.

Q3: How many lumens is a 60W incandescent bulb?
A: About 800 lumens. An equivalent LED would use only 8-10 watts at 80-100 lm/W efficacy.

Q4: Does color temperature affect lumens per watt?
A: Yes, warmer (more yellow) lights typically have slightly lower efficacy than cooler (more blue) lights at the same wattage.

Q5: Can I use this for all light types?
A: Yes, the formula works for any light source - LED, CFL, halogen, or incandescent - just use the correct efficacy value.