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Lamp Efficiency Formula

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Lamp efficiency refers to the effectiveness of a lamp or light source in converting electrical energy into visible light. It quantifies the ratio of light output (lumens) to electrical power input. Check FAQs

η = \frac{F}{P in}

η - Lamp Efficiency?F - Luminous Flux?P_in - Input Power?

Lamp Efficiency Example

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With units

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Here is how the Lamp Efficiency equation looks like with Values.

Here is how the Lamp Efficiency equation looks like with Units.

Here is how the Lamp Efficiency equation looks like.

0.1448 = \frac{42}{290}

0.1448lm/W = \frac{42lm}{290W}

0.1448 = \frac{42}{290}

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Lamp Efficiency Solution

Follow our step by step solution on how to calculate Lamp Efficiency?

FIRST Step Consider the formula

η = \frac{F}{P in}

Next Step Substitute values of Variables

∴

η = \frac{42lm}{290W}

Next Step Prepare to Evaluate

∴

η = \frac{42}{290}

Next Step Evaluate

∴

η = 0.144827586206897lm/W

LAST Step Rounding Answer

∴

η = 0.1448lm/W

Lamp Efficiency Formula Elements

Variables

Lamp Efficiency

Lamp efficiency refers to the effectiveness of a lamp or light source in converting electrical energy into visible light. It quantifies the ratio of light output (lumens) to electrical power input.

Symbol: η

Measurement: Luminous EfficacyUnit: lm/W

Note: Value can be positive or negative.

Formulas to find Lamp Efficiency

Luminous Flux

Luminous flux is a measure of the total amount of light emitted by a light source in all directions. It quantifies the overall brightness or output of the source.

Symbol: F

Measurement: Luminous FluxUnit: lm

Note: Value can be positive or negative.

Formulas to find Luminous Flux

Input Power

Input power refers to the amount of electrical power consumed by a device or system. It represents the energy input required to operate the equipment and is typically measured in watts or kilowatts.

Symbol: P_in

Measurement: PowerUnit: W

Note: Value should be greater than 0.

Formulas to find Input Power

Other formulas in Illumination Parameters category

Go Solid Angle

ω = \frac{A}{r^{2}}

Go Reduction Factor

RF = \frac{M.S.C.P.}{M.H.C.P.}

Go Number of Lamps Required for Illumination

N Lamp = \frac{E v \cdot A}{F \cdot UF \cdot MF}

Go Mean Spherical Candle Power

M.S.C.P. = \frac{F}{4 \cdot π}

How to Evaluate Lamp Efficiency?

Lamp Efficiency evaluator uses Lamp Efficiency = Luminous Flux/Input Power to evaluate the Lamp Efficiency, The Lamp Efficiency formula is defined as the ratio between the luminous flux and the power input. It is measured in lumens per watt. Lamp Efficiency is denoted by η symbol.

How to evaluate Lamp Efficiency using this online evaluator? To use this online evaluator for Lamp Efficiency, enter Luminous Flux (F) & Input Power (P_in) and hit the calculate button.

FAQs on Lamp Efficiency

What is the formula to find Lamp Efficiency?

The formula of Lamp Efficiency is expressed as Lamp Efficiency = Luminous Flux/Input Power. Here is an example- 0.144828 = 42/290.

How to calculate Lamp Efficiency?

With Luminous Flux (F) & Input Power (P_in) we can find Lamp Efficiency using the formula - Lamp Efficiency = Luminous Flux/Input Power.

Can the Lamp Efficiency be negative?

Yes, the Lamp Efficiency, measured in Luminous Efficacy can be negative.

Which unit is used to measure Lamp Efficiency?

Lamp Efficiency is usually measured using the Lumen Per Watt[lm/W] for Luminous Efficacy. Lumen Per Kilowatt[lm/W] are the few other units in which Lamp Efficiency can be measured.

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