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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
         

   
03/03/17 LED Bulbs: Enclosed versus Non-Enclosed Fixtures

Article - March 3, 2016 By LarsonElectronics.com

Battery Operated Ultraviolet Paint Curing LED Light Cart Dolly - 365NM - Four Adjustable Locking Lig

LED Bulbs: Enclosed versus Non-Enclosed Fixtures

Just because LEDs operate at cooler temperatures than traditional lamps, such as incandescent lights and CFLs, it does not mean that the modern luminaries can withstand all types of configurations and designs.


Enclosed Fixture Dilemma

Some LEDs come with a distinct warning for use in enclosed fixtures. Lighting manufacturers discourage consumers from using the bulbs in completely enclosed settings, due to heat dissipating issues. Simply put, in fully enclosed environments, LEDs have a difficult time managing heat, which can cause the temperature to rise inside the housing. Because enclosed designs are tight, heat has nowhere to go, and ends up going back to the bulb. Forcing an LED to function inside an enclosed fixture would greatly lower its lifespan, and cause inconsistent performance (flickering, shifts in color temperature and/or premature failure). It’s important to consider that abnormal conditions directly affect an LED’s ability to produce light. On the other end of the spectrum, if the bulb was exposed to bone-chilling temperatures below its standard operating threshold, it would also display signs of degradation.

Additionally, a handful of LEDs are designed to withstand high temperatures in tightly designed housings. The best way to know if an LED light can be used in enclosed environments is by checking the label. Buyers should pay close attention to normal room temperature recommendations, which is not the same as junction temperature settings. When in doubt, purchase LED units that are approved for enclosed fixtures. Alternatively, one could also opt to use lights that rely on older technology, including incandescent and CFL bulbs.


LED Thermal Management

The main concern with enclosed fixtures is the lack of vents or holes, which results in stagnant air flow and rapid accumulation of heat. As established earlier in the article, poor heat dissipation and high ambient temperatures can cause lumen depreciation or force an LED bulb to fail prematurely. Heat and LED light performance have an inverse relationship: when the temperature of the luminary’s junction increases, the light output of the lamp decreases. However, the performance of the light can recover, when the LED cools down or is exposed to lower temperatures.

Heat from LEDs is typically removed using conduction or convection. With focus on the latter method and considering that trapped air is not efficient in conducting heat, some designs have holes at the top and bottom side of the unit to promote vertical air flow over the light. Sealed environments, including enclosed fixtures, go against such designs, causing heat to build up around the LED.


Junction Temperatures and Epoxy Resins

LED junction temperatures are affected by the surrounding temperature of the fixture, the current going through the unit and the efficiency of the heat sinking components in and around the light. To ensure consistent performance at high ambient temperatures, some manufacturers install a compensation circuit in the unit, which adjusts and maintains the current running through the LED. This solution is not always effective, and exposure to high temperatures could still cause overdriving in LEDs with compensation circuits- ultimately shortening its intended lifespan.

Interestingly, high temperatures also have negative effects on epoxy resin qualities inside LEDs. Most LEDs are encapsulated in transparent, epoxy resin. At high temperatures, the resins shift and expand from a solid to a rubber-like state. To prevent such occurrences from contributing to the failure of the LED, the junction temperature must be maintained below the maximum temperature threshold of the epoxy resin. When the resin expands and contracts rapidly due to exposure to high temperatures, wire bonds inside the LED become displaced, resulting in untimely degradation of the affected wires.





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