Led Focusing Lumen
Led Focusing Lumen
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 Leatherman LED LENSER P7 AND P3 Flashlight COMBO 880062  US $54.95
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 7W Led Zoomable Focus CREE Flashlight Torch Battery 18650 Charger Holster US $9.49
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 300 Lm Zoomable Zoom CREE Q5 Led Lamp Flashlight Torch Bike Mount Free Gift US $11.98
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 300 Lumens Adjustable Focus CREE 160 Lm Led Lamp Flashlight Torch Free Gift US $14.79
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 300 Lumens Adjustable Zoom Focus CREE Led Flashlight Torch Battery Free Gift US $12.99
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 7W 400 Lumens Led Zoomable Adjustable Focus CREE Flashlight Torch Free Gift US $4.49
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 CREE COAST LED LENSER Tactical Focus 8407 P7 Hand Torch flashlight 200LM US $18.51
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 7W 400 Lumens Zoomable Zoom CREE Led Lamp HeadLamp HeadLight 160 lumens Torch US $8.49
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 7W 400 Lumens Zoomable Zoom CREE 160 Lm Led Lamp Flashlight Torch Free Gift US $14.99
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 7W 400 Lumens Led Adjustable Focus CREE Flashlight Torch Battery Free Gift US $5.99
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 300 Lumens Adjustable Zoom Focus CREE Led Flashlight Torch Free Gift US $10.98
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 1600LM Lumens CREE xml XM L T6 5 Mode Zoomable Focus LED Flashlight Torch US $9.51
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 LED Lenser P7 Advanced Focus System LED Flashlight Torch US $30.30
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 7W Mini Pocket Clip Zoomable Zoom Focus CREE 160 Lm Led Lamp Flashlight Torch US $6.99
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 NEW LED Lenser P14 Heavy Duty Flashlight 185 Lumens US $56.00
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 Coast Portland high performance LED flashlight Pure Be US $245.79
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 NEW LED Lenser MT7 Flashlight Glass Breaker 200 Lumens US $75.00
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 NEW LED Lenser P6 Flashlight One Hand Focus 120 Lumens US $49.99
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 MXDL SA 28 CREE Q5 3 Mode Lens 18650 AAA LED Flashlight Torch Camping Hiking US $16.88
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 Ultrafire G60 Cree BLUE LED Flashlight Torch 6v 6p G2 E US $19.18
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 Uwe CREE Green Light LED Flashlight hunter tactical remote switch 6P SIZE Torch US $33.88
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 UltraFire Torch CREE LED Flashlight Red Light 6P hunter tactical defender 6P SET US $33.88
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 Uwe CREE Red Light LED Flashlight hunter tactical defend remote pressure witch US $33.88
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 Ultrafire G60 Cree GREEN LED tactical Flashlight 18650 Remote Pressure Switch 6P US $34.88
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 UltraFire 501B CREE LED Red Light Green Light Bulb Flashlight Torch RCR123A 501B US $28.88
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 UltraFire G60 Torch CREE LED Flashlight Red Light 6P hunter tactical defender US $19.88
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 Ultrafire Cree Q5 200M Tactical 18650 Flashlight remote pressure switch 6P SIZE US $29.98
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 UltraFire CREE XM L T6 5 Modes 1600 LM ZOOM LED Flashlight Torch 18650 US $20.76
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 Pro UltraFire CREE XM L T6 5 Modes 1600 LM ZOOM LED Flashlight Torch 2x18650 US $17.72
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 1800 Lumen CREE XM L T6 LED Flashlight Torch Lamp Light HIKING HUNTING CAMPING US $2.25
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 TERRALUX EXTREME CREE LED UPGRADE BULB FOR AA MINI MAGLITE TLE 5EX 140 LUMENS US $10.50
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 CREE Q4 LED Zoom FlashlightWP2 Charger 14500 Battery US $46.66
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 A Pelican is an UGLY BIRD A STINGRAY is a BEAUTIFUL FLASHLIGHT Sexy SPORTY US $28.09
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 SMALL SUN ZY A3 CREE Q4 LED AA 14500 Zoom Flashlight US $9.50
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 Coast PX5 LED Flashlight 44 LUMENS US $10.00
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 1300LM Lumens Zoomable CREE XML XM L T6 3 Modes LED Flashlight Torch US $9.59
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 Streamlight is cool But STINGRAY is HOT Flashlight Charger 18650 Battery US $28.09
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 1000LM CREE XML T6 Led Z3 Zoomable Aluminum Alloy Flashlight Torch Skid proof US $10.99
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 4500LM TrustFire 5X T6 LED Supper Bright Flashlight Torch 18650 Water Resistant US $73.55
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 MAGLITE SOLITAIRE LED Upgrade L E D KIT SOLD OUT GET 1 BEFORE ITS TO LATE US $14.17
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 Z6 Adjustable Focus Zoom CREE XM L XML T6 1600lm LED Flashlight Charger US $9.99
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 New LED LENSER P7 KIT Flashlight Torch GUN Rifle Mount Press Switch 4 Hunting US $118.12
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 1600LM Lumens CREE xml XM L T6 5Mode LED Flashlight Zoommable Focus 18650 US $21.99
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 Trustfire 800 Lumens mini portable Key chain CREE XM L T6 LED Flashlight Torch US $19.99
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 NEW 3W Dual mode Rechargeable LED Flashlight Bike Light US $39.99
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 HL7 Focusing LED Headlamp with VLT US $41.99
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 LED Lenser P7 LED Torch Flashlight AUS Warranty Brisbane Stock Light in Gift Box US $58.69
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 Leatherman H7R 155 Lumens Flashlight 880022 Advaced Auto Focusing up to 145 M US $63.85
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 Leatherman Led Lenser M7R 210 Lumens Rechargable Flshlgh 880010 Auto Focuse US $111.00
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 SMALL SUN ZY A3 14500 CREE LED Zoom Flashlight Mount US $33.55
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 Hi Power 1800 Lumens CREE XM L T6 LED Bicycle Bike Light Headlamp Head Torch Red US $42.16
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 CREE xml XM L T6 1600Lm Lumens Zoom Focus LED Flashlight 18650 Charger US $29.99
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 Coast High Performance HP7 Titanium Lock Focus Beam High and low output modes US $42.95
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 Wolf Eyes Night Hunter AX Cree XM L U2 Digital HO LED Tactical Flashlight Torch US $104.99
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 TERRALUX EXTREME LED UPGRADE BULB FOR AA MAGLITE FLASHLIGHTS 140 LUMENS TLE5EX US $14.95
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 JETBeam RRT 01 Cree XM L T6 Magnetic CR123A LED FlashlightTitanium Pocket Clip US $97.99
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 Dimmer Zoom In out 3 Mode LED Focusing Glass Flashlight US $.99
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 TERRALUX EXTREME CREE P4 LED UPGRADE BULB FOR AA MINI MAGLITE TLE 5EX 140 LUMENS US $14.95
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 Genuine LED LENSER ® P7 Torch Flashlight with 2 Year Warranty US $78.91
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 AA MINI MAGLITE LED UPGRADE BULB by TERRALUX TLE 5EX 140 LUMENS NEW US $14.95
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 TERRALUX CREE LED UPGRADE BULB FOR AA MINI MAGLITE FLASHLIGHTS 140 LUMEN TLE5EX US $14.95
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 LED Lenser T7 Tactical Advanced Focus System LED Flashlight Torch US $38.67
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 TERRALUX CREE P4 LED BULB FOR AA MINI MAGLITE 140 LUMENS TLE 5EX US $17.95
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 TERRALUX CREE P4 LED BULB FOR AA MINI MAGLITE FLASHLIGHT 140 LUMENS TLE 5EX US $14.95
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 TrustFire 800Lm mini portable Key chain CREE XM L T6 LED Flashlight Torch Lamp US $16.99
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 1300LM Lumens CREE XML XM L T6 Zoomable 3 Modes LED Flashlight Torch 18650 US $18.99
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 Black H5 23 LUMENS FLASHLIGHT LED LENSER HEADLAMP IN BOX 880038 US $24.95
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 LED Lenser P7P3COMBO P7 LED Lenser Flashlight P3 Flashlight Combo Pack US $54.99
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 Mag Lite SP2201H 2 AA Cell Mini LED Flashlight with Holster Black NEW US $22.79
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 Solarforce M6 XM L Cree T6 LED Flashlight w Charger Rechargeble Battery Combo US $84.95
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 CREE Q3 LED Adjustable Zoom Focus Flashlight Torch Light US $7.99
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 Coast HP17 LED 615 Lumens 3 D Battery Flashlight New in Box US $79.99
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 TERRALUX BRIGHT LED BULB FOR AA MINI MAGLITE FLASHLIGHT 140 LUMENS TLE 5EX NEW US $14.95
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 Maglite Mag Charger System Multi Mode 240 Lumen AC DC Rechargeable NiMH RE1019 US $95.50
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 TrustFire 1000Lm mini portable Key chain CREE XM L T6 LED Flashlight Torch CR123 US $26.99
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 1600lm Lumen TrustFire CREE XM L XML T6 Zoomable LED Flashlight Torch 18650 CH US $47.55
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 TERRALUX SUPER BRIGHT EXTREME LED BULB for AA MINI MAGLITE 140 LUMENS TLE 5EX US $14.95
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 TrustFire Z5 CREE XM L XML T6 1600lm Lumen Zoomable Focus LED Flashlight Torch US $38.55
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 Black H14 200 LUMENS HEADLAMP w MOUNTING BRACKET LED LENSER 880044 US $89.95
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 NEW LED Lenser P5R Rechargeable Flashlight 200 Lumens US $82.00
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LED Lighting: 10 Things to Know
Light emitting diodes, or LEDs, are becoming increasingly popular and more high-quality LED lighting products are being manufactured and sold in the marketplace. LED lighting is an attractive alternative to incandescent or fluorescent lighting in both residential and commercial lighting applications because they are very energy-efficient, have very long lives, are very small in size, do not have any re-strike time, can be dimmable, generate relatively little heat, have a slow failure rate, are shock resistant, work well in low temperatures, their light can be easily focused, and they contain no toxic mercury unlike today’s popular energy-efficient lighting product, the compact fluorescent light bulb (CFL). Here are 10 things that you should know about this newly-emerging light source.
1. Colored and White LEDs LEDs can be red, green, blue, or amber. The color emitted by an LED is dependent upon the materials used to produce it. For example, a red LED is made from the chemical elements of aluminum, gallium, and arsenic. White LEDs are created by covering a blue LED with a yellow phosphorous coating. A white LED can also be created by using a red, blue, and green LED in close proximity to each other. At this time, there is not an LED that can emit white light. Producing an LED that could emit white light is the “holy grail” of LED light research.
2. LED Brightness A single high power LED can produce about 80 lumens of light. In comparison, a standard 60 watt incandescent light bulb produces about 900 lumens. Thus, a single high power LED is only about 1/11th as bright as a 60 watt incandescent light bulb. In order to produce adequate lighting, therefore, an LED fixture must contain groups of LEDs. However, the future is bright, pun intended, for LEDs. The lumen output of LEDs has almost doubled in the last two years.
3. LED Color Temperature Color temperature is a measure of the color appearance of a light source which helps describe the apparent “warmth” (reddish) or “coolness” (bluish) of that light. Light sources below 3200 Kelvin (3200K) are considered to be “warm;” while those above 4000K are considered to be “cool” light sources. For comparison, a traditional household incandescent light bulb is 2800K. The color temperature of a light source is not related to how hot the light source will get or how much heat is given off by the light. White LEDs vary in color temperature. Some white LEDs can be as “warm” in appearance as 2600K but most white LEDs are slightly “cool” in appearance. This is because most white LEDs are created by putting yellow phosphors over blue LEDs.
4. LED Color Rendering Color rendering index (CRI) is the ability for any light source to render colors accurately. The CRI scale goes from 1 (low pressure sodium) to 100 (the sun). A CRI of 75 is considered to be good, a CRI of 85 is considered to be very good, a CRI of 95 is considered to be excellent, and, of course, a CRI of 100 is considered perfect. LEDs in a warm white color temperature are currently available with a CRI of 80.
5. LED Efficacy As with all light sources, the efficacy of LEDs is measured in lumens/watt, the amount of light produced by one unit of power. Warm white LEDs produce between 25-44 lumens/watt while cool white LEDs are more efficacious by producing 47-64 lumens/watt. In comparison, the typical household incandescent light bulb creates 10-18 lumens/watt while compact fluorescent light bulbs produce 35-60 lumens/watt.
6. LED Drivers Fluorescent light bulbs require a ballast in order to function. The ballast provides a starting voltage and limits the electrical current to the light bulb. LEDs also require a similar electronic power source. For LEDs, this electronic power source is usually called an LED driver. The LED driver converts line power to the appropriate voltage (usually between two and four volts DC for high-brightness LEDs) and current (typically 200-1000 milliamps or mA), and may also include dimming and/or color correction controls. LED drivers are generally about 85% efficient. Thus, the efficacy of LEDs should be reduced by 15% to account for the LED driver.
7. LED Heat Generation It is a myth that LEDs do not generate heat. In fact, all light sources generate heat and LED lights are no different. Thus, it is important that an LED fixture is well-designed with “heat sinks” to adequately dissipate the heat that is created.
8. LED Lifespan LEDs do not burn out like an incandescent light bulb. Instead they get progressively dimmer over their lifetime until they no longer emit enough light to be useful. An LED is generally considered to be no longer useful when it is emitting only 70% of the original amount of light the LED produced. The time that this takes is often referred to as the “rated life” of an LED. While some LEDs may have a rated life of 100,000 hours, this is usually only under perfect laboratory conditions. Under real-world conditions most LEDs operating in light fixtures might last up to 60,000 hours. The rated life of an LED is often much less when the LED is operating in a light fixture as opposed to the same LED operating outside of a light fixture due to the buildup of heat inside the fixture. The typical LED inside of a typical light fixture may have a rated life of 35,000 to 60,000 hours.
9. OLED An OLED is an organic light emitting diode. It is an LED that also contains carbon. OLEDs are generally manufactured as flexible lightweight sheets. Today, OLEDs operate at significantly lower efficiency than inorganic (crystalline) LEDs. OLEDs typically generate less light per area than inorganic, solid state LEDs, which are usually designed for use as point-light sources.
10. Infrared and UV Radiation White LEDs do not emit infrared, or heat, radiation like an incandescent light bulb. In addition, white LEDs do not create ultraviolet radiation (UV rays) like a fluorescent light bulb.
Although there has been a lot of media attention given to LEDs, there are still far too many LEDs that are not well-designed. In short, the LED lighting market is still maturing. Research continues to improve LED brightness, efficacy, and the rated life of LEDs at a remarkable pace. However, in the short-term be cautious when selecting an LED lighting fixture.
This article, “LED Lighting: 10 Things to Know,” first appeared on the Pegasus Associates Lighting website.
About the Author
About the Author
Tom Farin is founder and President of Pegasus Associates Lighting. Dr. Farin has been in the field of lighting for over 20 years. He has extensive training and experience in lighting, physics, mathematics and education, acquired at the undergraduate level, in graduate school, and in the field. It is Dr. Farin's interest and expertise in education that drives the overall design of the www.PegasusAssociates.com site - with its heavy emphasis on lighting terminology, lighting techniques, and thorough information on each lighting product.