1. What is a Lumens to Watts Calculator?

Definition: This calculator converts light output in lumens to power consumption in watts for LED lighting based on luminous efficacy.

Purpose: It helps compare LED lighting efficiency and estimate energy usage when you know the light output requirements.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( W \) — Power consumption (Watts)
• \( L \) — Light output (Lumens)
• \( E \) — Luminous efficacy (Lumens per Watt)

Explanation: The light output in lumens is divided by the efficacy to determine the required power in watts.

3. Importance of Lumens to Watts Conversion

Details: This conversion helps in energy-efficient lighting design, comparing different LED products, and estimating electricity costs.

4. Using the Calculator

Tips: Enter the light output in lumens and the luminous efficacy (default 100 lm/W for typical LEDs). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is luminous efficacy?
A: It measures how efficiently a light source produces visible light (lumens per watt of electricity).

Q2: What's typical efficacy for LEDs?
A: Most modern LEDs range from 80-150 lm/W, with 100 lm/W being a good average value.

Q3: How does this compare to incandescent bulbs?
A: Incandescent bulbs typically have 10-17 lm/W, making LEDs 6-10 times more efficient.

Q4: Where can I find lumens information?
A: Lumens are listed on LED packaging or product specifications (replaces wattage for brightness).

Q5: Why is this conversion important?
A: It helps choose energy-efficient lighting and estimate operating costs when you know the required brightness.