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Re: [Phys-l] led flashlights



The LED Flashlights are item 97036, 2 for $4 on sale. I've seen them on sale twice in the last month or so, but if I had known how good they are, I would have paid the $6 regular price.
Another item you might want to look at is Rattle Snake Eggs, item 95942, two spherical magnets and two elliptic-cylindrical magnets, $2 on sale. Toss them into the air and they make a buzzing noise as they fall. I gave a set to a friend of mine who says he is able to throw all four into the air so they orbit around each other as they fall, buzzing all the way. I use them because they feel so interesting when I move them around in my hands. Below is the url for the current sale.
http://www.harborfreight22.com/r/r.asp?r=190522357&i=Q2763907H1

-----Original Message-----
From: "Anthony Lapinski" <Anthony_Lapinski@pds.org>

Eric:
What is the product number for that flashlight?
Anthony

Eric-Lane@utc.edu writes:
The newer led flashlights apparently have a voltage multiplier circuit
along with a voltage regulator that boosts the battery voltage up to what
the leds need. This means that you can use old batteries to power the
flashlight and get almost the same intensity as with new batteries,
although they don't last as long. I find this to be a great use for my
used AAA bateries that are too weak to power my calculators. Old
batteries work in small radios but they last so long that i've
accumulated a small box full of weak, but still usable batteries.
Mag-Lights@ with a tungsten filament that use AAA batteries also work
well but the light starts dim and gets dimmer as the battery is used up.
Leds keep the light level high for a shorter time. Great! I found mine at
Harbor Freight on sale for under $2 apiece (not an advertisement, just >a fact.)





Prof. Eric T. Lane eric-lane@utc.edu
Physics Dept. 2352 423-265-7804
The University of Tennessee at Chattanooga 37403-2409