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Bulb Led
This is question I do not usually ask myself but if you look into the end of your torch you may be surprised what you see. More and more torches are being made with LED's and not standard filaments but what are LED's and why are they so much better? Being a Physics graduate these are questions I should be able to answer, so I will try!
Light Emitting Diodes or LED's as they are more widely known create light by taking advantage of semiconductor physics. Now you do not need to know much about semiconductors apart from the fact that their conductivity or ability to allow electric current to pass through them can be manipulated to make them very resistant to electric current or conduct electricity like a metal. The LED will be a junction of two different types of semiconductors, one which contains lots of positive charges and one which contains lots of negative charges. We call this a PN (Positive-Negative) junction. Now normally these charges cannot approach each other (as we would expect positive and negative charges to do, attract) but if we apply a voltage across the LED using your AA batteries for example, we can push the positive and negative charges together. When the charges meet they anihalate with each other and the energy is released as light, brilliant!
So why is this better than your standard tungsten filament bulb. Well LED's are lit solely by the movement of Electrons (the negative charges I have discussed) . They have no filament that will burn out, no toxic materials like mercury or radon gas are required in their production and last up to 60 times longer than incandescent bulbs according to howstuffworks.com. LED's also do not suffer as dramatically from energy wastage as heat and so in the energy converting into light sense they are more efficient. However single LED's are not as bright as normal bulbs and so you usually see a cluster of LED's rather than a single one in any application. It is generally expected that LED's will replace incandescent bulbs in the future but alot of work needs to go into making them brighter while keeping them cost effective.
So what does this mean for you and me, the consumers. Well LED's are more economical, they just are. Heat is an incredible waste in a standard bulb and so any improvements we can make there will be worthwhile. For camping the slight loss in brightness from an LED torch will not be a problem and as you can see with a quick search on Amazon a very basic 17 LED Compact Torch retails for just £3.98! If you want to be more economical, perhaps make your batteries last that little bit longer and do your bit for the environment then choose LED. In fact why not be really environmentally friendly and combine the wind-up torch principle and LED lighting and purchase a LED wind-up torch like the Varta LED Dynamo Light - Wind Up Torch .
When will YA Politics switch that CFL lightbulb to an LED bulb to save energy for 0bama?
Should they pretend a windmill makes the energy or post the fact that Ohio gets 85% of its electricity from coal?
Why don't they show the 16 TRILLION pounds of coal that were burned by the US while Gore was VP for Bill Clinton?
Will that be after GE finds it to be more profitable to make LEDs instead of CFLs?
Will you republicans stop posting and replying here wasting energy?
Your ideas are intellegent than a burnt out light bulb.
And unlike a clock that never moves and is the right time twice a day, you'll never be right.
A halogen and LED GU10 bulb comparision
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 5 pc of 4W Hi-Power BLUE LED bulb MR16 12V globe lamp  US $29.75
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 5 pc of 4W Hi-Power GREEN LED bulb MR16 12V globe lamp US $29.95
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 5 pc of 4 Watt High Power WHITE LED bulb E14 globe lamp US $25.29
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 5 pc of 4 Watt WARM WHITE LED bulb MR16 12V globe lamp US $20.55
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 5 pc of 4W WHITE LED bulb B22 bayonet cap globe lamp US $25.16
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 BEST 2 X 7440 7443 RED 15 LED BRAKE STOP TAIL LIGHT BULB T20 US $10.00
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 42-LED White Car Auto Vehicle Interior Light Lamp Roof Dome Lighting Bulb DC 12V US $.99
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 LED BLUE #1 STEP COURTESY SIDE DOOR LIGHT BULBS a US $4.99
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Another great place to shop for Bulb Led products is Amazon. They have more than just books!
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Maverick GL-03 Cordless LED Grill Light
$22.99 Maverick GL03 Maverick Cordless Led Grill Light. This handy portable light features 4 brilliant LED bulbs which last 50,000 hours. Uses just 3 AA batteries (included) to provide convenient lighting anywhere. Energy efficient... |
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Sylvania 72441 LED Color Changing Coaster
$8.97 Using traditional coasters to protect your valuable furniture can now be mixed with modern technology. The Sylvania Dot-it LED Color Changing Coasters gradually transforms colors for an awe inspiring effect. The package comes with four coasters, each powe... |
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Polaris Scientific Whole House UV Ultra Violet Water Filter UV-8C 8 GPM
$255.99 Safe: No chemicals to use, have safe to drink water with no additives. UV does not change your water chemistry or add anything to your water. No THM's or other bad effects you get from other types of sanitation. * Simple to use! Fast simple installation. Two water connections and one electrical connection, just plug in the cord! Only maintenance is changing the bulb once a year. Automatic, n... |
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Rayovac SE3DLN Sportsman Xtreme 300-Lumen LED Lantern
$23.04 With optimized beams, rubber grips, and tactical switches, Rayovac's SE3DLN Sportsman Xtreme lantern is ideal for use inside and out, whether you're heading for the hills or camping out in your home during a power outage. Nicely compact and ultra-portable at just 7 inches tall and under 3.5 inches wide, the Rayovac SE3DLN lantern also provides an incredibly bright 300-lumen light that makes it a ... |
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Mr Beams MB360 Wireless LED Spotlight with Motion Sensor and Photocell - Weatherproof - Battery Operated - 140 Lumens
$16.99 Mr. Beams Intelligent LED Battery-Operated Lights Motion Sensor LED Spotlight Features MB360 Spotlightat a Glance: Battery-powered, wireless LED spotlight Attach anywhere Designed to work in all weather conditions Motion sensor with a range of up to 30 feet A... |
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Streamlight 73001 Nano Light Miniature Keychain LED Flashlight, Black
$3.75 FEATURES Easily attaches to just about anything with pocket clip or key ring: 1 Up to 8 hours run time: 2 Machined aircraft grade aluminum with anodized finish: 3 Uses 4 alkaline button cell batteries included: 4 White LED bulb with 10 lumens: 5 Weatherproof: 6 Includes a non-rotating snap hook for easy one handed operation when atta... |
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Earthmate EP05129 5-Watt Dimmable Candle 2700K Bulb, 6 Pack
$80.00 ... |
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Similac Alimentum Advance Protien Hydrolysate Formula With Iron, Ready To Feed - 32 oz / can, 6cans/pack
$53.99 Similac Alimentum Infant Formula Hypoallergenic with Iron Liquid - 6 Pack... |
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Earthmate EP085250 8-Watt, Dimmable BR30 2700K Bulb, 6 Pack
$146.94 ... |
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Panther Lighted Hat 3 LED - in your choice of colors
This exclusive 3 Way Lighting Technology means you now have one Lighted Cap that can provide you with distance lighting for running, walking, biking and more, while also satisfying your need for close up lighting. Provides lighting up to 50 feet away. Velcro closure.... |
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