1. What is the Lumens Calculation?

The lumens calculation converts electrical power (watts) to luminous flux (lumens) using the luminous efficacy of the light source. This helps compare the brightness of different light sources regardless of their power consumption.

2. How Does the Calculator Work?

The calculator uses the lumens equation:

Where:

• \( W \) — Electrical power in watts
• \( \frac{Lumens}{W} \) — Luminous efficacy (typically 80-120 for LED bulbs)

Explanation: The equation multiplies the power consumption by the light source's efficiency to determine the total light output.

3. Importance of Lumens Calculation

Details: Knowing the lumens output helps in selecting appropriate lighting for spaces, comparing energy efficiency of bulbs, and ensuring adequate illumination for tasks.

4. Using the Calculator

Tips: Enter power in watts and luminous efficacy in lumens per watt. Typical LED bulbs range from 80-120 lumens/W. Incandescent bulbs are much less efficient (about 10-17 lumens/W).

5. Frequently Asked Questions (FAQ)

Q1: How many lumens is a 100W LED bulb?
A: Assuming 100 lumens/W efficiency, a 100W LED would produce about 10,000 lumens.

Q2: What's the difference between lumens and watts?
A: Watts measure power consumption, while lumens measure light output. More lumens means brighter light.

Q3: What is a good lumens/W ratio?
A: Modern LED bulbs typically achieve 80-120 lumens/W. Higher values indicate more efficient bulbs.

Q4: How does this compare to old incandescent bulbs?
A: Incandescent bulbs only produced about 10-17 lumens/W, meaning LEDs are 6-10 times more efficient.

Q5: How many lumens do I need for a room?
A: Living rooms typically need 10-20 lumens/sq.ft, kitchens 30-40 lumens/sq.ft, and task lighting 50+ lumens/sq.ft.