1. What is a Lighting Cost Calculator?

Definition: This calculator estimates the electricity cost of operating lighting based on power consumption, usage time, and electricity rate.

Purpose: It helps homeowners and businesses understand and predict lighting expenses to make energy-efficient choices.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Cost \) — Total electricity cost (dollars)
• \( Watts \) — Power consumption of lighting (watts)
• \( Hours \) — Duration of operation (hours)
• \( Rate \) — Electricity cost per kilowatt-hour ($/kWh)

Explanation: The formula converts watts to kilowatts (dividing by 1000) and multiplies by time and rate to calculate total cost.

3. Importance of Lighting Cost Calculation

Details: Understanding lighting costs helps in budgeting, comparing different lighting technologies, and identifying energy-saving opportunities.

4. Using the Calculator

Tips: Enter the lighting wattage, hours of operation, and your electricity rate (default $0.12/kWh). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my lighting wattage?
A: Check the bulb/light fixture label or specifications. LED bulbs typically use 6-12W to replace 60W incandescent bulbs.

Q2: What's a typical electricity rate?
A: U.S. average is about $0.12-$0.15/kWh, but check your utility bill for exact rates.

Q3: Can I calculate monthly/annual costs?
A: Yes - multiply daily hours by 30 for monthly or 365 for annual estimates.

Q4: Does this account for multiple lights?
A: No - calculate each light separately or sum wattages for multiple identical lights.

Q5: How accurate is this calculation?
A: It provides a good estimate, but actual costs may vary with voltage fluctuations and dimming usage.