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ATEX and IEC Ex Flame-proof Explosion Proof Lighting & Equipment
Explosion Proof Lights
Explosion Proof Motors - Motors for Hazardous Locations
Industrial and Vaporproof Emergency Failsafe Lighting
Industrial Cord Reels and Tool Taps
Industrial Work Area Heaters
Machine Vision Lights
Megatower™
QC Series Industrial Portable Lighting - Quick Change Mount
Rig Lights
Stadium lights
String Lights and Temporary Light Stringers
Tank Cleaning Lights
Three Phase Motor Soft Starters
Vapor Proof LED Lights
Variable Frequency Drives (VFDs)
Vehicle Mounting Plates
Workboat Light Fixtures & Lighting Equipment
Yacht Engine Room Lights
Color Changing LED RGB Lighting
Explosion Proof Cord Reels
GOLIGHT Spotlights
Larson FUTURE - Lease Lighting
Remote Area Lighting and Scene Lights
Utility Bucket Mount, Receiver Hitch & Trailer Mount Lighting
Aevum Control Lighting and Equipment - IIoT
Butane and Solvent Extraction Room Lighting and Equipment
DC to DC Transformers and Power Supplies
Explosion Proof Fans & Blowers
Explosion Proof Paint Spray Booth Approved Lights
Explosion Proof String Lights
Explosion Proof Switchgear & Controls
Fleet Service Lights and Lighting Equipment
Industrial Equipment Trailers
Industrial Handlamps & Droplights
ISO 14644/FS-209E Clean Room Lighting
LED Blasting Lights
Night Time Fishing Lights
Portable AC Power Supply Units
Portable Power Distribution Panels
Power Distribution Panels with KVA Transformers
Self-Contained Lighting
Service Pit Lighting
Solar Generators & Solar Powered Lighting
Agricultural Farm Equipment Lighting & Beacons
Explosion Proof Cameras & Surveillance Systems
Explosion Proof Emergency Lights
Explosion Proof Heaters
Garage & Gas Station Canopy Lights
LED Grow Lights
LED Lights
NDT Ultraviolet Lights
Portable Hazardous Location Lighting
Radio Communication Towers and Equipment
Salt Water Processing Equipment
Shelter & Tent Lighting
Thermal Monitoring Cameras and Systems
48V LED Equipment Lights
ATEX Rated Explosion Proof Lights
Automotive Lighting
Class Rated Signals, Alarms, and Systems
Hazardous Location Area Lights and Portable Lighting
HID Equipment Lights
Hot Work Permit Lighting and Equipment
Hunting Lights
Industrial lasers
Industrial Transformers
Light Towers
Outdoor Lighting
Remote Security and Surveillance Systems
Temporary Construction Lights
Vehicle Mounted Spotlights
Equipment & Heavy Machinery LED Light Package Fitouts
Phase Converters - Single to Three Phase
Marine Shore Power Cords and Equipment
24 Volt Military Lights
Disaster Relief / First Responders / Search & Rescue Lighting
Plastic Handcuff Key
110/120 Volt Flood Lights
Post Mount Spotlights
Magnetic Work Lights
Crank-up Light Masts
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Intrinsically Safe Lights
Military Flashlights
LED Waterproof Lanterns
Work Area Lights
12 Volt Flood Lights
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Boat Spotlights
New Boat Lights
HID Boat Lights
Boat Dock Lights
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Remote Control Lights
Control Lights
Tow Lights
Magnetic Control Lights
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NEW Lights and New Products
Evaporative Coolers
Police Equipment
AC/DC Transformers
Power Supplies
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Military Spotlights 24V
Infrared Filters, Covert Covers, and Blackout IR Lenses
Military Equipment
Ultralife Batteries
Remote Control Pan Tilt Base
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Larson Electronics Spotlights
Larson Electronics Parts
Replacement Lamps
Cords - Brackets
Portable Wheeled Generators
Non-Hazardous Location Extension Cords / Plugs / Outlets
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HID Work Lights
HID Dive Lights
HID Off Road Lights
Acro Lights HID Lights
Halogen Lights
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Acro Light Flashlight
Xenon HID Flashlights
Powerlight Flashlight
HID Flashlights
Xenon Flashlights
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LED Status Lights
Forklift Lights
Tractor Lights
HID Post Mount Lights
Roof Mount Lights
Post Mount Light parts
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Flashlight Holder
Magnet Spotlight Base
Tripods-Magnetic Base
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Recharging Spotlights
Fire Rescue Lights
LED Street Lights
Utility Lights
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Hazard Lights
Strobe Lights - Battery Operated
Strobes & Beacons
Strobe Light Bars
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Headlights - Headlamps - Hard Hat Lights
Flashlights
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Suction Mount Lights
Magnetic Spotlights
12/24 Volt Spotlights
Gifts For Men
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New 12 / 24 Volt Lights
Explosion Proof Accessories and Replacement Parts
Explosion Proof Lighting
Explosion Proof Hand Lamps (Drop Lights)
Explosion Proof Lights - Stand/Dolly
Explosion Proof Tank Lights
Explosion Proof Phones and Intercoms
Explosion Proof Extension Cords
Black Friday & Cyber Monday Specials
Crane Lights
Explosion Proof Light Rentals
General Light Rentals
Light Tower and Light Plant Rentals
Power Distribution Rentals
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Power Plant Lighting
Refinery lights
Environmental Services Lights
Aerospace Lights
Chemical Plant Lights
Food Grade Safe Lights
Film and Entertainment Lights
Handheld Meters and Devices
Waste Water Treatment Lights
Mining Lights
Ship Yard Lights
Work Site Lighting
         

   
02/16/16 Lumen vs Foot-Candles – Which Is More Accurate for Measuring Illumination?

Article - February, 2016 By LarsonElectronics.com

Lumen vs Foot-Candles – Which Is More Accurate for Measuring Illumination?

ATEX rated hazardous location LED light fixture

When a customer is looking for lights, the most common question posed is “how bright is this light?” As lighting technology improves, the standard measurements of illumination aren’t always the most accurate in calculating a light’s output. Understanding how each rating is determined will help you choose the best fixture for an application.


What's the Difference?

Lumens are defined as a measure of the total amount of light emitted from a source. Foot-candles are the measured amount of light falling on a specific point or object. So while both measurements are relevant, they are definitely not the same thing. As LED lights have become more common, many users are convinced that a high lumen output is most important factor when choosing a light. An explosion proof LED light may produce 10,000 lumens, but that does not take into account the beam spread or the distance it is mounted from the desired target point. An LED light might produce a tremendous amount of light, but if the beam is quite narrow, it will not illuminate a large area surrounding the beam.

Measuring foot-candles involves the determining size of the area to be illuminated, the height and angle the light will be mounted at, and how much light each fixture will produce. It is a more detailed process, but provides a more accurate assessment. For example, it might be written – “To achieve 40 foot-candles, you will need 6 fixtures mounted at a height of 20 feet.” Certain types of fixtures, such as high-bay lights, are designed to produce more foot-candles at greater heights than a standard fixture will. Whereas hazardous area low bay fixtures are designed for lower mounting heights, and generally have lower lumen output since they are close to the ground. Do not hesitate to ask your lighting supplier to help you determine how many foot-candles you will need for an application.


Measuring the light to get things right

Lighting designers will use different tools to determine the amount of light that a fixture or fixtures will provide. The first option is a light meter. The meter measures the level of visible light or illumination. The illumination is stated as foot candles or LUX. The accuracy and of measurement of light meters vary widely. For example, most meters for indoor measurements are not accurate enough for outdoor lighting measurements.

For indoor readings, place the meter on the horizontal work location. This reading is the task illumination. To calculate the get the average illumination for the room, take readings in a grid pattern, at 30 inches above the floor, and average the grid points. In areas such as warehouse aisles, the vertical illumination is more important than horizontal. To calculate vertical illumination readings, hold the meter vertically at the task surface such as a shelf.

The second method used to determine light output is by using lighting design software such as AGi32. AGi32 is a simulation tool used to design lighting projects and calculate the amount of light that will be delivered based on the user-set parameters. The resulting calculations are commonly referred to as layouts. This type of software is capable of calculating the amount of light that will be delivered in any kind of design, interior or exterior, and incorporate surrounding objects, obstructions, and varying shapes like vaulted ceilings or rooms in non-linear shapes. It aids lighting designers and engineers in the evaluation of lighting designs for projects prior to construction. AGi32 can also simulate realistic renderings of how an area will look once the lighting fixtures are installed. It can incorporate a variety of design needs such as numerous rooms and objects in the same project, and it aids in estimating fixture spacing.


Using a light meter or design software will provide essentially the same results, but the software can incorporate many different factors into the results. It is also more convenient to determine foot-candles on the software as the user does not have to be at the location to calculate such. The designer can enter the data on a project half-way around the world and accurately calculate the lighting their customer needs for their application.

Assessing your lighting needs will take a little time and effort. A number doesn’t tell the whole story, nor will it get you the fixture that is best suited for you. Taking into account the area, the application, any obstructions that may block the light output, and the fixture chosen will reduce the frustration and disappointment that comes with an uninformed purchase.


The in-house lighting designers at Larson Electronics are well versed in designing energy efficient layouts for new facilities as well as retrofitting exisiting halogen, high pressure sodium, and metal halide lamps with LED light fixtures. We can provide you with IES files for lighting analyis, or we can provide lighting studies and layouts for the project at hand.

At Larson Electronics, we do more than meet your lighting needs. We also provide replacement, retrofit, and upgrade parts as well as industrial grade power accessories. Our craftsmen can custom build any lighting system and/or accessories to fit the unique demands of your operation. A commitment to honesty, quality, and dependability has made Larson Electronics a leader in the lighting and electronics business since 1973. Contact us today at 800-369-6671 or message sales@larsonelectronics.com for more information about our custom options tailored to meet your specific industry needs.





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