1. What is an Energy Savings Lighting Calculator?

Definition: This calculator estimates the cost savings from switching to more energy-efficient lighting (e.g., LED bulbs).

Purpose: It helps homeowners and businesses evaluate the financial benefits of upgrading their lighting systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( W_{\text{old}} \) — Wattage of old light bulbs
• \( W_{\text{new}} \) — Wattage of new, efficient bulbs
• \( \text{Hours} \) — Hours of usage
• \( \text{Rate} \) — Electricity cost per kilowatt-hour ($/kWh)

Explanation: The difference in wattage multiplied by usage hours gives watt-hours saved, converted to kWh, then multiplied by the electricity rate.

3. Importance of Energy Savings Calculation

Details: Proper calculation helps justify lighting upgrades, forecast ROI, and reduce energy bills while lowering carbon footprint.

4. Using the Calculator

Tips: Enter the wattage of your current bulbs, wattage of new bulbs, daily/weekly/monthly usage hours, and your electricity rate (default $0.12/kWh).

5. Frequently Asked Questions (FAQ)

Q1: What's a typical electricity rate?
A: The U.S. average is about $0.12-$0.15/kWh, but check your utility bill for exact rates.

Q2: How do I find my bulb wattages?
A: Check labels on bulbs or packaging. Old incandescent bulbs are typically 40W-100W, while equivalent LEDs are 5W-15W.

Q3: Should I enter daily or annual hours?
A: The calculator works with any time period - results will be savings for that same period.

Q4: What if I have multiple bulbs?
A: Multiply the savings per bulb by the number of bulbs, or enter total wattages for all bulbs combined.

Q5: Does this include bulb replacement costs?
A: No, this calculates energy savings only. Subtract new bulb costs for net savings.