Mag Instrument: Difference between revisions

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Like other lighting technologies, LED lighting does not produce only light, [http://en.wikipedia.org/wiki/Thermal_management_of_high-power_LEDs but also heat.] LED technology today is such that only about 30% of the energy going into an average LED is turned into light. The rest is turned into heat.
Like other lighting technologies, LED lighting does not produce only light, [http://en.wikipedia.org/wiki/Thermal_management_of_high-power_LEDs but also heat.] LED technology today is such that only about 30% of the energy going into an average LED is turned into light. The rest is turned into heat.


The Maglite LED 2-CELL AA,<ref name="2AA">
The Maglite LED 2-CELL AA,<ref name="2AA">NLee the Engineer (15 September 2010) [http://www.amazon.com/review/R2LJT6DHWDCB6F Contains outdated 1st-gen Maglite LED flashlights] ''Customer Reviews: Maglite 3D / 2AA LED Flashlight 2 Piece''. Amazon.com, Inc. Retrieved 23 January 2013. "The 2nd-gen models solved the thermal problem. Previous models over-heat easily, and their light dim down after just a few minute of operation."
{{cite web
{{cite web
|title=Contains outdated 1st-gen Maglite LED flashlights
|title=Contains outdated 1st-gen Maglite LED flashlights
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</ref> and some other Maglite LED flashlights, used two techniques to avoid overheating:
</ref> and some other Maglite LED flashlights, used two techniques to avoid overheating:


* To cool off the LED, each of these flashlights included imperfect heat-dissipation technology:<ref>
* To cool off the LED, each of these flashlights included imperfect heat-dissipation technology:<ref>Wang, Robin (20 January 2012). [http://www.led-resource.com/2012/01/maglite-ml100-led-flashlight-review/ Maglite ML100 LED Flashlight Review]. LED-Resource. Retrieved 24 January 2013. "Previous generations of Maglite’s MAG-LED technology, including the original LED drop-in replacements and even the current LED D-cell lights, had problems with heat dissipation and irregular beam patterns because they were originally designed for incandescent bulbs."
{{cite web
{{cite web
|title=Maglite ML100 LED Flashlight Review
|title=Maglite ML100 LED Flashlight Review
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|date=20 January 2012
|date=20 January 2012
|quote=Previous generations of Maglite’s MAG-LED technology, including the original LED drop-in replacements and even the current LED D-cell lights, had problems with heat dissipation and irregular beam patterns because they were originally designed for incandescent bulbs.}}
|quote=Previous generations of Maglite’s MAG-LED technology, including the original LED drop-in replacements and even the current LED D-cell lights, had problems with heat dissipation and irregular beam patterns because they were originally designed for incandescent bulbs.}}
</ref>  a poorly-designed [http://en.wikipedia.org/wiki/Thermal_management_of_electronic_devices_and_systems#Heat_sinks heat sink,]<ref name="2C_upgrade">
</ref>  a poorly-designed [http://en.wikipedia.org/wiki/Thermal_management_of_electronic_devices_and_systems#Heat_sinks heat sink,]<ref name="2C_upgrade"> NewBie (16 July 2006). [http://www.candlepowerforums.com/vb/showthread.php?119665-MagLite-2C-2D-4D-3W-LED-drop-in-Technical-Review MagLite 2C LED drop-in Technical Review]. ''CandlePowerForums LED flashlight forum''. Post 1. Retrieved 23 January 2013. "We are looking at nearly a 60% drop in output, due to the LED getting hot, from a severe lack of good heatsinking."
{{cite web
{{cite web
|title=MagLite 2C LED drop-in Technical Review
|title=MagLite 2C LED drop-in Technical Review
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|author="NewBie"
|author="NewBie"
|date=16 July 2006|at=Post 1
|date=16 July 2006|at=Post 1
|quote=We are looking at nearly a 60% drop in output, due to the LED getting hot, from a severe lack of good heatsinking}}.</ref> made of thin [http://en.wikipedia.org/wiki/Stamping_(metalworking) stamped] metal.<ref>
|quote=We are looking at nearly a 60% drop in output, due to the LED getting hot, from a severe lack of good heatsinking}}.</ref> made of thin [http://en.wikipedia.org/wiki/Stamping_(metalworking) stamped] metal.<ref>NewBie (16 July 2006). [http://www.candlepowerforums.com/vb/showthread.php?119665-MagLite-2C-2D-4D-3W-LED-drop-in-Technical-Review MagLite 2C LED drop-in Technical Review]. ''CandlePowerForums LED flashlight forum''. Post 1. Retrieved 23 January 2013. "Here we go, one of those for your eyes only, which reveals the secrets and the shortcomings, and explains a great many things [...]"
{{cite web|title=MagLite 2C LED drop-in Technical Review
{{cite web
|title=MagLite 2C LED drop-in Technical Review
|url=http://www.candlepowerforums.com/vb/showthread.php?119665-MagLite-2C-2D-4D-3W-LED-drop-in-Technical-Review
|url=http://www.candlepowerforums.com/vb/showthread.php?119665-MagLite-2C-2D-4D-3W-LED-drop-in-Technical-Review
|work=CandlePowerForums LED flashlight forum
|work=CandlePowerForums LED flashlight forum
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|quote=Here we go, one of those for your eyes only, which reveals the secrets and the shortcomings, and explains a great many things [...]}}.</ref>
|quote=Here we go, one of those for your eyes only, which reveals the secrets and the shortcomings, and explains a great many things [...]}}.</ref>


* Also, as each flashlight's LED heated up, the flashlight provided less power to the LED, which caused it to dim and to produce less heat. If the flashlight was moved into a cooler environment, it instantly brightened again.<ref>
* Also, as each flashlight's LED heated up, the flashlight provided less power to the LED, which caused it to dim and to produce less heat. If the flashlight was moved into a cooler environment, it instantly brightened again.<ref> NewBie (16 July 2006). [http://www.candlepowerforums.com/vb/showthread.php?119665-MagLite-2C-2D-4D-3W-LED-drop-in-Technical-Review MagLite 2C LED drop-in Technical Review]. ''CandlePowerForums LED flashlight forum''. Post 1. Retrieved 23 January 2013. "When the module is hot, soaking them with a lot of cold spray causes the light output to jump back to when you first turned it on, and the current goes right back up at the same time."
{{cite web
{{cite web
|title=MagLite 2C LED drop-in Technical Review
|title=MagLite 2C LED drop-in Technical Review
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</ref>
</ref>


Some criticized these flashlights for dimming so much so much due to the poor heat sink.<ref name="2C_upgrade" /><ref>
Some criticized these flashlights for dimming so much so much due to the poor heat sink.<ref name="2C_upgrade" /><ref>[http://flashlightreviews.com/reviews/maglite_mag-led.htm Maglite Mag-LED: 2, 3, and 4 cell modules] FlashlightReviews Archive. Retrieved 23 January 2013. "Some very knowledgeable folks [...] discovered poor heatsinking for the LED, which the circuitry then has to compensate for by quickly lowering output as the module heats up. [...] What I didn't like: Module heats up quickly and output drops quickly."
{{cite web
{{cite web
|title=Maglite Mag-LED: 2, 3, and 4 cell modules
|title=Maglite Mag-LED: 2, 3, and 4 cell modules
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</ref> There existed costlier flashlights with better thermal management.
</ref> There existed costlier flashlights with better thermal management.


In 2009, Mag Instrument modified the Maglite LED 2-CELL AA and Maglite LED 3-CELL D to each include a better heat sink. Even during extended use, those flashlights now stay at a reasonable temperature without dimming themselves.<ref name="2AA" /><ref>
In 2009, Mag Instrument modified the Maglite LED 2-CELL AA and Maglite LED 3-CELL D to each include a better heat sink. Even during extended use, those flashlights now stay at a reasonable temperature without dimming themselves.<ref name="2AA" /><ref>NLee the Engineer (11 September 2010) [http://www.amazon.com/review/R19LDXP4LJKG36 =Maglite second-gen LED flashlight deserves a second chance] ''Customer Reviews: Maglite SD3D016 3-D Cell LED Flashlight''. Amazon.com, Inc. Retrieved 23 January 2013. "Improved Heat Sink: The overheating problem found in 1st-gen LED modules has been solved. That is, the light no longer dims down after just a few minutes of operation. [...] Better Power Management: The new Maglite maintains constant power consumption of 2W as long as battery voltage is above 3.5V."
{{cite web
{{cite web
|title=Maglite second-gen LED flashlight deserves a second chance
|title=Maglite second-gen LED flashlight deserves a second chance
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