Home
Back
Energy Efficiency Formula:
| From: | To: |
Energy efficiency of a light bulb measures how effectively the bulb converts electrical energy into visible light. It is expressed as a percentage and indicates the proportion of electrical input that is transformed into useful light output rather than wasted as heat.
The calculator uses the energy efficiency formula:
Where:
Explanation: The formula calculates the percentage of electrical energy that is converted into visible light, with higher percentages indicating more efficient bulbs.
Details: Calculating energy efficiency helps consumers choose cost-effective lighting solutions, reduces energy consumption, and contributes to environmental sustainability by minimizing wasted energy.
Tips: Enter light output in lumens and electrical input in watts. Both values must be positive numbers greater than zero for accurate calculation.
Q1: What is a good energy efficiency percentage for light bulbs?
A: Modern LED bulbs typically achieve 80-100 lumens per watt, translating to 8-10% efficiency. Higher percentages indicate better energy performance.
Q2: How does this compare to traditional incandescent bulbs?
A: Incandescent bulbs are only about 2-3% efficient, while LED and CFL bulbs are significantly more efficient at 8-15% and 6-9% respectively.
Q3: Why is energy efficiency important for light bulbs?
A: Energy efficient bulbs reduce electricity costs, decrease environmental impact, and have longer lifespans, making them more economical over time.
Q4: Are there limitations to this calculation?
A: This calculation provides a basic efficiency measure but doesn't account for factors like color rendering index, light distribution patterns, or bulb lifespan.
Q5: How can I improve my lighting energy efficiency?
A: Choose LED bulbs with high lumens per watt ratings, use dimmers and sensors where appropriate, and ensure proper fixture maintenance for optimal performance.