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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
Megatowerâ„¢
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
         

   
02/06/11 LED Fluorescent Tube Fixtures: Efficiency Beyond Lumens vs Watts

Fluorescent tube lights currently represent the overwhelmingly dominant form of lighting in most commercial and industrial applications. Their relatively high efficiency and long life coupled with the ability to provide good color rendering make them an obvious choice for use in warehouses, shopping centers, schools, offices and the like. Despite their obvious benefits, fluorescent tubes do retain several undesirable qualities that currently show little chance of being improved upon in the future. Since fluorescent lamp development has for the most part reached the far end of its maximum potential, there is little chance for any new or major breakthroughs to occur. Fluorescent lamps by their design are prone to several problems. For instance; although fluorescent lamps are efficient, they also require ballast assemblies in order to operate. These ballast although improved upon with the switch from magnetic units to electronic solid state circuitry, still represent an increased source of energy consumption, reducing the overall efficiency of the fluorescent tube. In addition, these ballasts tend to be prone to failures and operational deviances over the course of their lifetimes that adds further expense through replacement costs and reduced fixture effectiveness.

With the advent of the compact fluorescent, public awareness of the fluorescent lamp has been increased, in large part increasing the concern for the toxic materials necessary to a fluorescent lamps operation. Fluorescent tubes require mercury, a highly toxic substance, in order to function. In the fluorescent lamp, mercury vapor is excited through application of an electrical charge. This causes the mercury atoms to emit short length ultra-violet waves which then cause a phosphor to glow, resulting in radiated light. This process is much more efficient than incandescent lamps and generally results in an efficient and long lived light source. The problem, however, is what to do with these lamps once they have reached the end of their operational life span. The mercury vapor within these lamps poses a serious health risk and so these lamps must be carefully disposed of to avoid the mercury escaping from the fragile glass tubes should breakage occur.

One of the greatest sources of limitation for fluorescent tube lamps, however, stems from their basic design. In a fluorescent tube, light is created and radiated evenly over the entire tubes surface. Although a 60 watt fluorescent tube may produce up to 5,000 lumens of light output, this light is distributed over a wide area in all directions away from the tube. The end result is that light is spread in a 360 degree pattern, with any given area at a specific point from the lamp only receiving a small portion of the radiated illumination. In some cases, only 50% of a fluorescent lamps output actually reaches the intended area. With fluorescent tube fixtures, this necessitates the need for added directional control of the radiated light in order to achieve effective illumination of the targeted areas. To create this control reflectors and specially designed housings must be used. While such directional control can effectively reflect much of the otherwise wasted light into more productive directions, the reflective properties of the materials used and the shape of the reflectors still cause a great deal of the lamps output to miss the intended area.

With the arrival of LEDs into the commercial and industrial marketplace a serious alternative to the fluorescent tube was introduced. Although early in their appearance LEDs were still behind the fluorescent in overall output efficiency, they quickly advanced and are now poised to surpass the practical use lumen per watt ratio of fluorescent lamps. LEDs retain several distinct advantages over fluorescent lamps. For example; LEDs do not require any ballast for their operation. Using entirely solid state electronics, the current and output of LEDs can be easily regulated and maintained. There is no initial startup or warm up period normally associated with ballast equipped luminaries. This gives LEDs the benefit of not requiring a ballast which would add to their overall energy consumption. Reliability and cost effectiveness is also improved as there is no ballast to replace. LEDs are themselves solid state in their construction. They resemble circuits more than they do a lamp. There is no glass, no filament, and perhaps most importantly, no toxic gases or materials used in their construction.

One of the biggest advantages LEDs have over the fluorescent lamp, however, is their directional nature. As noted earlier, much of the light created by the fluorescent lamp is radiated over a very wide area. This reduces efficiency as light is lost to dissipation rather than reaching the intended target area. LEDs when set up in tube configuration, however, can be easily arranged to direct light in a precisely defined pattern and direction. Whereas fluorescent lamps require a reflector to gather and direct light, a comparable LED fixture needs none to direct all of its light onto the targeted surfaces. If we assume 50% directional efficiency with a 120 watt fluorescent fixture producing 8,000 lumens in 360 degrees of radiance, then approximately 4,000 lumens of light is lost to dissipation in unwanted directions.

An LED tube fixture like a Larson Electronics EPL-48-2L-LED Explosion Proof LED light with 4 foot LED bulbs producing approximately 4,500 lumens with 48 watts however radiates illumination only over a 150 degree area. The result is that much more of the light is directed downwards and over the intended target area, in effect putting more light where it is needed with less overall lumens and less wattage consumed. The net result is more light where it is needed, using less power, achieved with a fixture that will last over twice as long as a fluorescent with less maintenance and replacement costs.

When considering lighting options there is much more to the picture than just total wattage and lumens. How the light is produced, what it costs to operate, and how efficiently that light is applied are all contributing factors that must be taken into account if the best lighting solution is to be found. Although most of the allure surrounding LEDs has been centered around their efficient operation, as can be seen here, how they produce light and how efficiently that light is applied is no less important and a large part the overall efficiency equation. 





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Category/Product (click on link below for more information)
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Explosion Proof Emergency Lights & Fluorescent light Combination - 4 foot - 2 lamps - Class I, Div I
Explosion Proof Hand Light - 26 Watt Fluorescent Light - Class 1, Division 1 - 50 foot Cord
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Explosion Proof Drop Light - 24 Volt AC/DC - 100 Watt Incandescent - 100' Cord - Twist Lock Plug
Explosion Proof Fluorescent Handheld Light - Class 1 Division 1 and Class II Division 1
Replacement Base Stand for EPL-BS-70-100 70 Watt Metal Halide Light
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Explosion Proof 15 Watt Fluorescent Aluminum Drop Light - Class I Division 1 - 100' Cord
Explosion Proof Light - 400 Watt Metal Halide - Class 1 Div 1 & Class 2 Div 1 - IP67
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Class 1 Division 1 300 Watt Incandescent Light - Explosion Proof - Wall Mount - 120 Volts
Explosion Proof Fluorescent Light - Hand Lamp (Drop Light) - 120 Volts - 250 foot SOOW Cord
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Replacement Dome and Gasket for EPL-120 and EPL-230 Series Explosion Proof Lights
Explosion Proof Light - Inline Transformer 120V/LV - 150 Watt Bulb - Class 1 Groups C,D - 100' Cord
Explosion Proof Drop Light (Hand Lamp) with Inline Transformer - 120 volts input to 12 volt
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