Question 1

How do lux and lumens relate?

Accepted Answer

Lumens measure total light output; lux measures light per square meter. Lux = Lumens ÷ Area. A 1000 lumen bulb creates 1000 lux at 1m² but only 250 lux at 4m².

Question 2

What lux levels are found in nature?

Accepted Answer

Direct sunlight: 100,000 lux. Overcast day: 1,000 lux. Office: 500 lux. Full moon: 0.3 lux. Starlight: 0.0001 lux.

Question 3

What's the difference between lumens and lux?

Accepted Answer

Lumens measure total light output from a source. Lux measures light arriving at a surface. Same lumens in a smaller area = higher lux.

Question 4

How do I convert old wattage to lumens?

Accepted Answer

Roughly: 40W incandescent ≈ 450 lumens, 60W ≈ 800 lumens, 100W ≈ 1600 lumens. LED equivalents use 80-90% less power for same lumens.

lx to lm Converter

Frequently Asked Questions

Explore Financial Toolset

Compound Interest Calculator

Mortgage Calculator

Debt Payoff Calculator

Retirement Calculator