1. What is a Lighting Energy Saving Calculator?

Definition: This calculator estimates the cost savings from switching to more energy-efficient lighting by comparing the power consumption of old and new lights.

Purpose: It helps homeowners and businesses evaluate the financial benefits of upgrading to energy-efficient lighting solutions like LEDs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Savings \) — Cost savings in dollars
• \( W_{old} \) — Wattage of old light (watts)
• \( W_{new} \) — Wattage of new light (watts)
• \( Hours \) — Hours of usage
• \( Rate \) — Electricity cost ($ per kWh)

Explanation: The difference in wattage multiplied by hours gives energy savings in watt-hours, which is converted to kWh and multiplied by the electricity rate.

3. Importance of Lighting Energy Savings

Details: Lighting accounts for about 15% of home electricity use. Switching to efficient lighting can significantly reduce energy bills and environmental impact.

4. Using the Calculator

Tips: Enter the wattage of your current and new lights, estimated hours of use per period, and your electricity rate (default $0.12/kWh).

5. Frequently Asked Questions (FAQ)

Q1: How do I find my current light's wattage?
A: Check the label on the bulb or fixture. Standard incandescent bulbs are typically 40-100W, CFLs 9-26W, LEDs 4-20W.

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

Q3: Should I include all lights or just frequently used ones?
A: Focus on lights used several hours daily for maximum savings impact.

Q4: How do I estimate hours of use?
A: Track usage for a week or estimate based on room type (e.g., 4 hrs/day for living room, 1 hr/day for closet).

Q5: Does this include bulb replacement costs?
A: No, this calculates only energy savings. Efficient bulbs often last longer, providing additional savings.