1. What is a Lighting Energy Cost Calculator?

Definition: This calculator estimates the electricity cost for lighting based on wattage, usage hours, and electricity rate.

Purpose: It helps homeowners and businesses understand and manage their lighting energy expenses.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Cost — Electricity cost in dollars ($)
• Watts — Power consumption of the lighting (W)
• Hours — Daily usage time (hours)
• Rate — Electricity cost per kilowatt-hour ($/kWh)

Explanation: The formula converts watts to kilowatts (by dividing by 1000) then multiplies by hours and rate to get total cost.

3. Importance of Lighting Cost Calculation

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

4. Using the Calculator

Tips: Enter the wattage of your lighting, daily usage hours, 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 packaging. LED bulbs typically range from 4-20W, CFLs 9-52W, and incandescent 40-150W.

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

Q3: Can I calculate monthly or yearly costs?
A: Yes, either enter total monthly/yearly hours, or multiply the daily result by 30 or 365.

Q4: Does this account for multiple lights?
A: No, for multiple lights, either sum their wattages or calculate each separately.

Q5: How accurate is this calculation?
A: It provides a good estimate, but actual costs may vary slightly due to voltage fluctuations and other factors.