Tyler Brooks
Lighting is an essential aspect of any commercial building, and foot candles are a critical unit of measurement in lighting design. A foot candle is a measure of light intensity, specifically the light that reaches a surface, and it is used to ensure that various environments are safe and functional. The number of foot candles required in a commercial building depends on the nature of the work being done and the specific lighting requirements of the space. This article will explore the concept of foot candles, the recommended lighting levels for different commercial spaces, and the importance of understanding foot candles when designing lighting systems for commercial buildings.
| Characteristics | Values |
|---|---|
| Definition | A foot-candle is a measurement of light intensity |
| Measurement | One foot-candle equals 10.76 lumens or lux |
| Usage | Foot candles are used to determine the right lighting for a space, ensuring safety and functionality |
| Standards | OSHA, IES, and other organizations have specific foot-candle requirements and recommendations for different spaces and industries |
| Examples | An office space typically requires 40 foot-candles, while an auto shop requires 50 foot-candles |
| Lighting Plan Software | Software is available to calculate and simulate foot-candle readings for a given space |
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What You'll Learn
Lighting plan software
One foot-candle is equivalent to one lumen of light per square foot, or approximately 10.76 lumens. Foot-candles are used to measure light intensity, ensuring that a space has the required lighting levels for safety and functionality. Different spaces have different lighting requirements; for example, a warehouse will need different lighting from a big-box store, and an office will need different lighting from a classroom.
There are several lighting plan software options available, each with its own unique features and capabilities. DIALux evo, for instance, allows users to design lighting for indoor and outdoor areas using real luminaires, standards-compliant calculations, and realistic visualizations. It also supports IFC and integrates seamlessly with BIM processes for smooth data exchange. Additionally, DIALux evo enables users to position emergency luminaires and identify optimization potential using a real-time false colour preview.
Dialight offers a free lighting layout solution with features such as simple room design and full 3D rendering capabilities. This software can generate industry-standard reports in as little as 10 minutes, ensuring accurate lighting designs. Dialight's cloud-based catalog allows users to quickly access current IES files and easily incorporate them into the lighting layout software.
For stage and lighting design, Wysiwyg is a popular choice known for its ease of use and powerful design features. It can handle various file formats, including Cad files, making it a versatile option. VectorWorks is another powerful software specifically designed for entertainment, lighting, and stage designers. While it comes with a higher price tag, it is used by top stage and scenic designers for its extensive features.
Overall, lighting plan software plays a crucial role in ensuring that commercial buildings have adequate lighting to meet safety and functionality standards. By utilizing these software tools, designers can make informed decisions about lighting placement, intensity, and distribution to create well-lit and compliant spaces.
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Foot candles vs lux
Lighting is an important aspect of any commercial building, and understanding the right amount of lighting is crucial for employee safety and efficiency. This is where foot candles and lux come into play.
Foot candles and lux are both units of measurement that describe the amount of light falling on a specific point or object. One foot-candle is equivalent to approximately 10.76 lumens or lux. In simpler terms, a foot candle is a measurement of the light that reaches a surface, while lumens measure the total amount of light produced by a fixture.
When it comes to commercial lighting, foot candles are the preferred unit of measurement. This is because they help determine the required lighting levels for various environments, ensuring safety and functionality. For example, a big box store will require different lighting levels compared to a packaging warehouse, even if they have similar square footage. Sports lighting is another application where foot candles are important, as they ensure optimal visibility for players and spectators.
Lux, on the other hand, is the metric measurement, with one lux being equivalent to one lumen per square meter. While lux may not be as commonly used as foot candles in commercial lighting, it is still an important unit of measurement. Understanding the relationship between lumens, lux, and foot candles is essential when designing lighting layouts to ensure adequate illumination and safety for occupants.
To determine the appropriate lighting levels for a commercial building, lighting plan software can be used. This software takes into account various factors such as the size of the area, the mounting height of the light fixtures, and the number of lumens produced by each fixture. By simulating foot candle readings, the software can provide detailed reports on light levels and balance within the space. Additionally, photometric studies can be conducted to generate data on foot candles and ensure uniform lighting across the space.
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Foot candles in different rooms
Foot candles are a crucial aspect of designing an effective lighting setup for commercial buildings. They are a measure of light intensity, with one foot-candle equalling approximately 10.76 lumens, or one lumen per square foot. This unit of measurement is essential for ensuring that different areas within a commercial building receive the intended light levels, creating a balance between employee safety and efficiency.
The Illuminating Engineering Society of North America (IES) has provided recommendations for foot-candle levels in different rooms to ensure adequate illumination and safety. For instance, an open office, private office, classroom, or laboratory would require 40 foot-candles. In contrast, a warehouse with aisles or cold storage would need 20 foot-candles.
When it comes to specific rooms within a commercial building, the lighting requirements vary. For example, a 100-square-foot dining room should have 30-40 foot-candles, translating to 3,000-4,000 lumens. A living room typically demands fewer foot-candles, ranging from 10-20, and consequently, fewer lumens, with a requirement of 1,000-2,000 lumens.
Kitchens and bathrooms also tend to require more foot-candles than living rooms or bedrooms due to the importance of good lighting in these spaces. A kitchen may need 70-80 foot-candles, while a bathroom could require 50-70 foot-candles. It's worth noting that the lighting requirements for a bedroom are similar to those of a living room, with a range of 10-20 foot-candles suggested.
To achieve the desired foot-candle measurements in a room, one can adjust the number of light fixtures and their positioning. By adding more lights, the foot-candle measurements will generally increase, creating a brighter space. However, it's important to use lighting plan software or a photometric study to ensure the lighting design considers the physical characteristics of the room and the desired light distribution.
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Foot candles in outdoor spaces
Lighting requirements for outdoor spaces vary depending on the activities that take place in the area, the users, and the surrounding lighting conditions.
Lighting Requirements for Outdoor Spaces
Outdoor areas require more lighting than indoor spaces, with requirements ranging from 100 to over 10,000 foot-candles. For instance, a public outdoor area surrounded by darkness may require less lighting, with 2 to 5 foot-candles recommended for dark public areas. Building entrances and vital outdoor locations may need up to 5 foot-candles, while infrequently used entry points can be lit with just 1 foot-candle. Parking lots, substations, and backgrounds like fences and walls can be illuminated with 2 foot-candles.
Lighting Requirements for Specific Tasks
The lighting requirements for a space also depend on the activities that take place in that area. For reading and detailed tasks, 50 foot-candles of lighting is recommended. Conference rooms and areas where visually challenging tasks are occasionally performed can have lighting between 10 and 20 foot-candles. For special office spaces, such as health or medical establishments where visual tasks of low contrast are conducted, 100 to 200 foot-candles are recommended.
Lighting Plans for Outdoor Spaces
To determine the appropriate lighting for outdoor spaces, lighting plans can be created using industry-leading software that calculates light levels and provides details on light balance. These plans involve installing lights in a software "space" and running calculations by simulating foot-candle readings on the ground.
Factors Affecting Lighting Requirements
It is important to note that lighting requirements are influenced by various factors, including the space to be illuminated, the activities performed, and the users. For example, a classroom for elementary school children would require less illumination than an office for working adults, as ageing leads to a decline in eyesight. Additionally, the lighting requirements for a laboratory conducting detailed experiments would differ from those of a typical office or classroom.
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Calculating the number of fixtures
The number of fixtures required for a commercial building depends on several factors, including the size of the space, the height of the ceiling, the desired light intensity or foot-candle level, and the lumen output of the fixtures.
To calculate the number of fixtures needed, you can use the following formula:
> Square footage x desired foot-candles = total lumens required
> Total lumens required / lumen output of fixture = number of fixtures required
For example, let's say you have a commercial space that is 3,200 square feet with a ceiling height of 16 feet, and you want to achieve an average of 50 foot-candles, as recommended by the IES for auto shops.
> 3,200 x 50 = 160,000 lumens
> 160,000 lumens / 35,735 lumens per fixture = 4.4 fixtures
Since you can't have a fraction of a fixture, you would need to round up to 5 fixtures to meet the desired foot-candle level.
However, it's important to note that simply adding 5 fixtures may not result in uniform lighting throughout the space. The light will spread and become dimmer as you move away from the source. To address this issue, you may need to adjust the placement of the fixtures or increase the number of fixtures to ensure even illumination.
In the previous example, it was found that doubling the number of fixtures to 8 resulted in uniform lighting and achieved the desired foot-candles throughout the space. This demonstrates that calculating the number of fixtures is an iterative process that involves considering the specific characteristics of the space and the lighting fixtures being used.
Additionally, it's worth mentioning that lighting plan software can be a valuable tool for more complex spaces. This software can simulate foot-candle readings on the ground and provide detailed reports on light levels and balance within a space, helping to ensure that the lighting design meets the desired specifications.
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Frequently asked questions
A foot-candle is a measurement of light intensity, or the amount of light that reaches a surface. One foot-candle is equal to one lumen of light per square foot, or approximately 10.76 lux.
The recommended number of foot-candles varies depending on the type of commercial building and the activities being carried out. For example, an office space typically requires 40 foot-candles, while a warehouse may require 20 foot-candles.
The right number of foot-candles is important for ensuring safety and functionality in a commercial building. Inadequate lighting can lead to eye strain, fatigue, and headaches among employees. Additionally, certain organizations, such as OSHA, have specific foot-candle requirements for different industries.
