Question 1

What is the difference between lumens and lux?

Accepted Answer

Lumens measure total light output from a source, while lux measures light intensity at a surface. Lux = lumens per square meter.

Question 2

How do I choose the right brightness for a room?

Accepted Answer

General lighting needs 300-500 lux, task lighting 500-1000 lux, and detailed work 1000+ lux. This calculator helps convert between lighting units.

Question 3

What is luminous efficacy?

Accepted Answer

Luminous efficacy (lumens per watt) measures how efficiently a light source converts power to visible light. LEDs typically achieve 80-120 lm/W.

Question 4

How do I convert between candela, lumens, and lux?

Accepted Answer

These units are related but measure different things. This converter handles the mathematical relationships, accounting for beam angle and distance where needed.

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