Another grossly overdriven LED flashlight?

[Doug S]

I saw a Princeton Tec "Impact" in use recently. It was quite bright for a light using a single 5mm LED. Has anybody measured the current draw of this light with either fresh batteries or a known applied voltage.

 

[Charles]

Hi Doug, whished I could help you on that one, but
i've got this Luxeon project going on right now
called>>> DSSL.. Thats the Doug S. super light.

You may be aware of this.

 

[Charles]

Oh, by the way could you recomend a good a DC current tester??

 

[Doug S]

Originally posted by Charles:
Oh, by the way could you recomend a good a DC current tester??

<font size="2" face="Verdana, Arial">Chuck: even most inexpensive multimeters have current ranges up to 10A. A consideration in measuring currents thru LEDs is to ensure that the insertion of the meter [or other means of measurement] does not affect the current to much. One trick is to insert a 0.1 ohm resistor into the circuit and then measure the voltage drop across it. 1A = 100mv. [BTW, mapped 4500' yesterday and every foot was virgin]

 

[Charles]

Thanks again Doug. Hmm almost a mile, was it tight or did it open up??

 

[Doug S]

Has anyone measured current?

 

[Doug S]

Anyone?

 

[NightStorm]

Hey Doug,

Here ya' go: < 5hrs. on Duracell AA alkalines

5.96V

85 ma <freakin' high, isn't it?>

Dan

 

[Doug S]

Thanks Dan. I presume that the voltage quoted was battery NL voltage rather than loaded.

 

[NightStorm]

Sorry about that, 5.74V loaded.

Dan