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Luminous flux (lumens) is the total perceived light output. Luminous efficacy (lm/W) measures how efficiently electricity is converted to visible light. LED: 80–120+ lm/W vs incandescent: ~15 lm/W.

공식

Luminous flux (lumens) = Luminous intensity (candelas) × Solid angle (steradians) | 1 lumen ≈ 1 candela × 1 steradian

단계별 가이드

1Lumens = Watts × Efficacy (lm/W)
2Higher lumens = brighter light
3Higher lm/W = more efficient; lower running cost
4800 lumens ≈ old 60W incandescent brightness

풀어진 예시

입력

10W LED, 100 lm/W efficacy

결과

1,000 lumens — equivalent to ~75W incandescent

자주 묻는 질문

What is Luminous Flux?

Luminous flux (lumens) is the total perceived light output. Luminous efficacy (lm/W) measures how efficiently electricity is converted to visible light

How accurate is the Luminous Flux calculator?

The calculator uses the standard published formula for luminous flux. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

What units does the Luminous Flux calculator use?

This calculator works with inches, watts. You can enter values in the units shown — the calculator handles all conversions internally.

What formula does the Luminous Flux calculator use?

The core formula is: Lumens = Watts × Efficacy (lm/W). Each step in the calculation is shown so you can verify the result manually.

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