Luminous Flux Converters
Convert between lm, klm, and Mlm using exact lumen-based luminous flux scaling. This hub covers lighting-output and fixture-output comparisons with dedicated mirror pages for each direction.
Scope & Verification
This hub groups related converter families so you can move from the category level to exact routes with one clear basis per page.
- Families are split so exact-factor, profile-based, density-based, and estimate-style pages do not collapse into one generic answer.
- Leaf pages keep calculator, common values, FAQ, and reverse routes aligned to the same assumption.
- Methodology and verification pages document how those assumptions are chosen and checked.
Explanation
Luminous flux is the total visible light output emitted by a source and is measured in lumens (lm), the SI unit of luminous flux. In this hub, all units are normalized through lumens with exact base-10 prefix scaling. Exact definitions include 1 klm = 1,000 lm and 1 Mlm = 1,000,000 lm. These conversions are purely multiplicative with no offsets, so mirror pages remain mathematically stable and reversible. For clarity, luminous flux conversions in this hub are grouped by SI base-to-prefix and prefix-to-prefix relationships.
Frequently Asked Questions
What is a lumen?
A lumen is the SI unit of luminous flux and represents the total perceived visible light emitted by a source.
What is the SI unit of luminous flux?
The SI unit of luminous flux is the lumen (lm).
How many lumens are in 1 kilolumen?
Exactly 1,000 lumens.
How many lumens are in 1 megalumen?
Exactly 1,000,000 lumens.
Are luminous flux conversions multiplicative?
Yes. SI prefix conversions are purely multiplicative with no offsets.
How do I switch direction?
Open the mirror page for the reverse conversion when you need the same lumen-based relationship in the opposite direction.