1. What is an LED Lighting Calculator?

Definition: This calculator determines the electrical power required for an LED light source based on its luminous output and efficacy.

Purpose: It helps lighting designers, engineers, and homeowners estimate power requirements for LED lighting installations.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( W \) — Electrical power (Watts)
• \( \Phi \) — Luminous flux (lumens)
• \( E \) — Luminous efficacy (lumens per Watt)

Explanation: The luminous flux (total light output) is divided by the efficacy (how efficiently the light source converts power to light) to determine the required electrical power.

3. Importance of LED Power Calculation

Details: Proper power calculation ensures energy-efficient lighting design, correct electrical system sizing, and optimal light output for the application.

4. Using the Calculator

Tips: Enter the desired luminous flux in lumens and the LED's luminous efficacy (default 100 lm/W). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is typical luminous efficacy for LEDs?
A: Modern LEDs typically range from 80-150 lumens/Watt, with high-efficiency models reaching 200+ lm/W.

Q2: How do I find the luminous flux I need?
A: Determine your space's lighting requirements in lux or foot-candles, then calculate total lumens needed based on area.

Q3: Why is efficacy important?
A: Higher efficacy means more light output per watt, resulting in lower energy costs for the same brightness.

Q4: Does this account for driver losses?
A: No, consider adding 10-15% to the calculated power to account for LED driver inefficiencies.

Q5: How does this compare to traditional lighting?
A: LEDs typically use 75-90% less power than incandescent bulbs for the same light output.