Lux vs Foot Candle Explained for Lighting Measurement Malaysia

Lux vs Foot Candle Explained for Lighting Measurement Malaysia

Introduction

Lux and foot candle are two commonly used units for measuring illuminance.

Illuminance describes the amount of visible light falling onto a surface. It is important in workplace lighting inspections, industrial facilities, offices, warehouses, schools and commercial buildings.

In Malaysia, lighting measurements are generally expressed in lux (lx) because lux is the SI unit of illuminance. However, some imported lighting specifications, overseas technical documents and international project requirements may use foot candles (fc).

Understanding the difference between these units helps engineers, facility managers, electrical contractors and maintenance personnel interpret lighting measurements correctly.

A digital lux meter, such as the Benetech GM1030C, can be considered for practical illuminance measurement in workplace and building applications.

This guide explains what lux and foot candles mean, how to convert between them and how these units are used in real lighting inspections.

1. What Is Lux?

Lux (lx) is the SI unit used to measure illuminance.

One lux is equal to one lumen per square metre.

1 lux = 1 lumen/m²

Lux describes how much luminous flux falls onto a particular surface area.

For example, a workbench receiving 500 lux has an illuminance of 500 lumens per square metre at the measurement surface.

Lux is commonly used in:

Factory lighting inspection

Warehouse lighting measurement

Office lighting assessment

Classroom lighting inspection

Commercial building maintenance

Industrial LED lighting evaluation

Workplace illuminance testing

When measuring lighting with a digital lux meter, the reading represents illuminance at the position and orientation of the sensor.

It does not directly describe the total light output of a lamp.

2. What Is a Foot Candle?

A foot candle (fc) is another unit of illuminance.

One foot candle is equal to one lumen per square foot.

1 foot candle = 1 lumen/ft²

Foot candles are commonly encountered in lighting specifications and technical documents originating from the United States.

Some lighting design references, equipment manuals and international project documents may specify illuminance in foot candles rather than lux.

For example, a lighting specification might state that a work area should receive 30 foot candles.

This can be converted into lux for comparison with measurements or specifications expressed in SI units.

3. Lux vs Foot Candle - What Is the Difference?

Both lux and foot candles measure the same physical quantity: illuminance.

The difference is the surface area unit used in their definitions.

MeasurementLuxFoot CandleSymbollxfcDefinitionLumens per square metreLumens per square footMeasurement quantityIlluminanceIlluminanceUnit systemSIImperial or US customaryCommon useMalaysia and many international standardsCommon in US lighting referencesConversion1 lx = 0.092903 fc1 fc = 10.7639 lx

Neither unit is inherently more accurate.

They are simply different ways of expressing the same illuminance measurement.

Important: Converting between lux and foot candles changes the numerical unit, not the actual lighting condition.

4. Lux to Foot Candle Conversion Formula

To convert lux into foot candles, use:

Foot Candles = Lux / 10.7639

Alternatively:

Foot Candles = Lux × 0.092903

Example 1 - Convert 100 Lux to Foot Candles

100 / 10.7639 = 9.29 fc

100 lux ≈ 9.29 foot candles

Example 2 - Convert 300 Lux to Foot Candles

300 / 10.7639 = 27.87 fc

300 lux ≈ 27.87 foot candles

Example 3 - Convert 500 Lux to Foot Candles

500 / 10.7639 = 46.45 fc

500 lux ≈ 46.45 foot candles

These calculations are useful when comparing Malaysian lighting measurements with overseas technical specifications.

5. Foot Candle to Lux Conversion Formula

To convert foot candles into lux, use:

Lux = Foot Candles × 10.7639

Example 1 - Convert 10 Foot Candles to Lux

10 × 10.7639 = 107.64 lux

10 fc ≈ 107.64 lux

Example 2 - Convert 30 Foot Candles to Lux

30 × 10.7639 = 322.92 lux

30 fc ≈ 322.92 lux

Example 3 - Convert 50 Foot Candles to Lux

50 × 10.7639 = 538.20 lux

50 fc ≈ 538.20 lux

When preparing inspection reports, use a consistent unit throughout the document and identify any converted values.

6. Lux to Foot Candle Conversion Table

The following table provides common illuminance conversions.

Lux (lx)Foot Candles (fc)100.93504.651009.2915013.9420018.5830027.8740037.1650046.4575069.681,00092.901,500139.352,000185.81

The values are rounded for practical reference.

For technical calculations, use the full conversion factor where appropriate.

7. Foot Candle to Lux Conversion Table

Foot Candles (fc)Lux (lx)110.76553.8210107.6415161.4620215.2825269.1030322.9240430.5650538.2075807.291001,076.391501,614.59

These conversions can help when interpreting international lighting specifications.

8. Practical Example - Office Lighting Measurement

Consider an office workstation where the measured illuminance is 450 lux.

To convert the reading into foot candles:

450 / 10.7639 = 41.81 fc

450 lux ≈ 41.81 foot candles

The measurement describes the same lighting condition in either unit.

For workplace assessments, the result should be compared with the relevant task-specific lighting criteria.

A converted value alone does not determine whether the workstation meets an applicable lighting standard.

9. Practical Example - Factory Lighting Inspection

Factories contain different working areas, including production lines, machine stations and quality control inspection tables.

Suppose a hypothetical assembly workstation has a measured illuminance of 600 lux.

The conversion is:

600 / 10.7639 = 55.76 fc

600 lux ≈ 55.76 foot candles

This conversion may be useful when a factory receives equipment documentation specifying lighting conditions in foot candles.

However, the suitability of the lighting still depends on the actual visual task, measurement method and applicable criteria.

10. Practical Example - Warehouse Lighting Measurement

Warehouses may have different lighting conditions at storage aisles, picking stations and packing tables.

Suppose a warehouse picking station has a measured illuminance of 250 lux.

The conversion is:

250 / 10.7639 = 23.23 fc

250 lux ≈ 23.23 foot candles

If an international project document specifies lighting in foot candles, the converted value can help maintenance personnel compare the measurement with the stated requirement.

Before making a compliance decision, confirm that the specification applies to the actual work activity and measurement plane.

11. What Is the Difference Between Lux, Lumens and Foot Candles?

These terms are related but should not be confused.

Lux

Lux measures illuminance, or the luminous flux falling onto a surface per square metre.

Foot Candle

Foot candle also measures illuminance, but uses square feet instead of square metres.

Lumens

Lumens measure luminous flux, which describes the total quantity of visible light emitted, transmitted or received per unit time in photometric terms.

Example

A lighting fixture may have a rated luminous flux of 5,000 lumens.

However, this does not mean that every surface beneath the fixture receives 5,000 lux.

Actual illuminance depends on factors such as:

Distance from the fixture

Beam distribution

Mounting position

Surface orientation

Obstructions

Room geometry

Reflective surfaces

A digital lux meter measures illuminance at a particular location rather than the total lumens produced by a fixture.

12. Why Does Distance Affect Lux Readings?

Illuminance often decreases as the distance from a light source increases.

For an ideal point source under suitable conditions, illuminance follows the inverse square law.

Illuminance is proportional to 1 / Distance²

For example, doubling the distance from an ideal point source can reduce illuminance to approximately one-quarter of its original value.

However, real indoor lighting systems often involve multiple luminaires, large light-emitting surfaces and reflected light.

Therefore, the simple inverse square relationship should not be applied blindly to every factory, warehouse or office lighting arrangement.

Practical measurements should be taken at the actual working surface.

13. How to Measure Illuminance Using Benetech GM1030C

The Benetech GM1030C Digital Lux Meter can be considered for practical illuminance measurement.

Step 1 - Identify the Measurement Location

Select the area requiring lighting assessment.

Examples include an office desk, production workstation, classroom table or warehouse packing station.

Step 2 - Prepare the Instrument

Inspect the lux meter and ensure that the sensor is clean.

Check the instrument's operating condition and follow the manufacturer's instructions.

Step 3 - Position the Sensor

Place the sensor at the appropriate measurement plane.

For horizontal illuminance, orient the sensor appropriately on the horizontal working surface.

For vertical illuminance, use the orientation required for the surface being assessed.

Step 4 - Avoid Unwanted Shadows

Do not block the sensor with your body or hands.

Avoid changing the normal lighting conditions during measurement.

Step 5 - Record the Reading

Allow the reading to stabilise.

Record the illuminance value together with the measurement location and operating conditions.

Step 6 - Convert Units If Required

If the instrument displays lux, the result can be converted into foot candles using the standard formula.

Do not assume that a particular GM1030C unit provides a selectable foot-candle display unless this feature is confirmed in the product documentation.

14. Common Mistakes When Comparing Lux and Foot Candles

Mistake 1 - Assuming Lux and Foot Candles Measure Different Things

Both units measure illuminance.

Correct understanding: They represent the same quantity using different area units.

Mistake 2 - Using the Wrong Conversion Factor

Multiplying lux by 10.7639 produces an incorrect foot-candle conversion.

Correct formula: Foot Candles = Lux / 10.7639.

Mistake 3 - Confusing Lux with Lumens

Lux measures illuminance at a surface, while lumens describe luminous flux.

Correct understanding: A luminaire's lumen rating is not the same as the lux reading at a workstation.

Mistake 4 - Ignoring the Measurement Plane

A reading at floor level may differ from a reading at desk height.

Correct approach: Measure at the plane relevant to the visual task.

Mistake 5 - Assuming Converted Readings Prove Compliance

Converting 500 lux into foot candles does not establish whether the lighting is suitable.

Correct approach: Compare the measurement with applicable task-specific criteria and use the required assessment method.

Mistake 6 - Comparing Readings Taken Under Different Conditions

Daylight, lighting controls and fixture operation can affect illuminance.

Correct approach: Document the measurement conditions and maintain consistency when comparing results.

15. Which Unit Should Be Used for Lighting Measurement in Malaysia?

In Malaysia, lux is generally the preferred unit for workplace lighting measurement because it is the SI unit of illuminance.

Many professional lighting references and technical documents express illuminance requirements in lux.

Foot candles may still appear in imported equipment manuals, overseas lighting designs and international project specifications.

When preparing a Malaysian workplace lighting inspection report, using lux as the primary unit generally improves consistency.

Where necessary, foot-candle equivalents can be included for reference.

For formal workplace assessments, consult the applicable standards and guidance, including MS ISO/CIE 8995-1, where relevant.

16. Choosing a Digital Lux Meter for Lighting Inspection

When selecting a digital lux meter in Malaysia, consider the intended measurement application.

Important factors include:

Measurement Range

Confirm that the instrument can measure the illuminance levels expected at the site.

Accuracy

Review the manufacturer's stated accuracy and relevant measurement specifications.

Sensor Characteristics

Check the instrument's suitability for the light sources and measurement conditions involved.

Display Readability

A clear display can make on-site measurements easier to record.

Calibration Requirements

For professional assessments, determine whether calibration documentation is required.

Portability

A portable instrument can be useful when moving between factory workstations, warehouse aisles and office desks.

Measurement Units

If foot-candle readings are needed, verify whether the selected model supports direct unit selection or whether manual conversion will be used.

The Benetech GM1030C is one model that customers can enquire about for portable illuminance measurement.

Before purchasing, confirm its technical specifications and available functions against the intended application.

17. Applications of Lux and Foot Candle Measurements

Illuminance measurements are relevant to many industries.

Manufacturing Facilities

Checking illumination at machine stations, assembly areas and inspection benches.

Warehouses and Logistics Centres

Measuring lighting at storage aisles, picking stations and packing tables.

Offices and Commercial Buildings

Evaluating desk-level illumination and meeting room lighting.

Schools and Universities

Measuring illuminance at classroom desks, whiteboards and library reading areas.

Electrical and Lighting Contractors

Supporting lighting installation checks and maintenance comparisons.

Facility Management

Recording illuminance measurements for routine building maintenance.

In all these applications, selecting the correct measurement plane and assessment method is more important than whether the result is expressed in lux or foot candles.

18. Benetech GM1030C Digital Lux Meter Supplier Malaysia

MTM Precision Sdn Bhd supplies portable measuring and testing instruments for industrial, commercial and technical applications.

Customers looking for a Benetech GM1030C Digital Lux Meter in Malaysia can contact our team for product information, availability and suitability enquiries.

We welcome enquiries from customers in Selangor, Kuala Lumpur, Johor, Penang, Melaka, Negeri Sembilan, Perak, Pahang, Kedah, Kelantan, Terengganu, Perlis, Sabah and Sarawak.

For faster assistance, share your lighting measurement application, expected illuminance range and calibration requirements.

Frequently Asked Questions

Q1. What is the difference between lux and foot candles?

Both measure illuminance. Lux uses lumens per square metre, while foot candles use lumens per square foot.

Q2. How many lux are in one foot candle?

1 foot candle = approximately 10.7639 lux.

Q3. How many foot candles are in 100 lux?

100 lux = approximately 9.29 foot candles.

Q4. How do I convert lux to foot candles?

Divide the lux value by 10.7639.

Q5. How do I convert foot candles to lux?

Multiply the foot-candle value by 10.7639.

Q6. Is lux or foot candle more accurate?

Neither unit is inherently more accurate. Measurement accuracy depends on the instrument and measurement method.

Q7. Which lighting unit is commonly used in Malaysia?

Lux is generally used because it is the SI unit of illuminance.

Q8. Can Benetech GM1030C be used to measure illuminance?

Yes. The GM1030C is a digital lux meter intended for illuminance measurement. Its suitability for a specific task depends on the manufacturer's technical specifications.

Q9. Does Benetech GM1030C display foot candles?

This feature should be confirmed from the specific GM1030C product documentation. Lux readings can be converted mathematically if necessary.

Q10. Can lux readings determine whether workplace lighting meets a standard?

Lux readings provide important information, but formal assessment requires the correct measurement procedure, task-specific criteria and suitable instrument.

Q11. Can a lux meter measure the lumens of a lighting fixture?

A conventional lux meter measures illuminance at its sensor. It does not directly determine a fixture's total luminous flux.

Q12. Where can I enquire about Benetech GM1030C in Malaysia?

Contact MTM Precision Sdn Bhd for product information, availability and assistance with your lighting measurement requirements.

Conclusion

Understanding lux vs foot candle is important for interpreting lighting measurements and comparing technical specifications.

Both units measure illuminance, but lux uses square metres while foot candles use square feet.

The standard conversion is:

1 foot candle = 10.7639 lux

1 lux = 0.092903 foot candles

For most workplace lighting measurements in Malaysia, lux is the commonly used unit.

The Benetech GM1030C Digital Lux Meter provides a portable option for collecting illuminance readings in factories, warehouses, offices, schools and commercial buildings.

For customers seeking a digital lux meter for professional lighting measurement in Malaysia, MTM Precision Sdn Bhd welcomes your enquiry.

Contact MTM Precision Sdn Bhd

MTM Precision Sdn Bhd

Showroom & Service Centre:

No. 29-1 & 29-2, Jalan Bandar 18,

Pusat Bandar Puchong,

47160 Puchong, Selangor, Malaysia.

Tel: 03-8080 7172

WhatsApp: +6016-660 7346

Email: mtmpre@yahoo.com

Website: www.mtmpre.com.my

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