Lighting

Lumens to Candela Calculator — ChiefEngineer.in

Convert luminous flux to luminous intensity for a specified beam angle.

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Formula

Iv = Φv / Ω, Ω = 2π(1 − cos θ)

Variables

  • Φv — flux (lm)
  • Ω — solid angle (sr)

Worked Example

Input: 1000 lm, 120° beam

Result: I ≈ 318.31 cd

Assumptions & Notes

Requires beam angle. Lumens alone do not determine candela.

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