What kind of LED


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Old 12-16-17, 11:46 PM
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What kind of LED

Well, back in the day, I'd go to RS and probably find what I needed...and I can find things for my truck or car pretty easy...but not this.

I have a set of those 10X binocular magnifiers...like below, only a bit cheaper made. I don't really care cause I got a real good price at the flea market, but one of the LEDs is kaput it seems. Can't take it back and it works ok with one eye and use the other lens as a separate monocular, but would like to get a new LED, to at least have the option of 2 lighted lenses.

Plenty of LEDs on Ebay cheap enough, just not sure of the specs. It's got a focusing lens, and I can get the physical size ok, (T1 or T1 3/4 I think) but I'm confused on the specs. Getting old and don't do this everyday anymore.

It uses 2 - 3V watch batteries with a simple sliding switch, no electronics in it anywhere. So do I want 3.4V fwd voltage? But that only gives me a max of 4v fwd, with 5V max reverse. With a 6V supply, won't that cause an issue? Long life I don't care, but I want them to at least last long enough to use them.
 
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Old 12-17-17, 02:23 AM
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A typical LED has a forward voltage (Vf) drop between 1.8-2.5 vdc when lit. Just replace the LED with one that has a Vf=1.8-2.5 vdc.
 
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Old 12-17-17, 11:56 AM
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Ahh, ok, over thinking. I guess I was thinking it needed a certain voltage to function, like bias voltage maybe. Told you it had been a long time since I needed to think about this stuff.
 
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Old 12-17-17, 01:43 PM
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I'd go ahead and replace both LEDs to ensure uniformity. That way you don't want have to worry about two different LEDs with different intensities.
 
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Old 12-17-17, 05:19 PM
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Well, the best prices are packs of 50 for $5 w/ free shipping...so I probably will...lol.
 
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Old 12-19-17, 12:29 AM
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Holy crud...no idea you could get them that cheap if you were willing to wait a while. Bought 100 pc brite white from a distributor in CA for $2.50 free shipping should get just after Xmas, and while I was looking bought a 375 pc multi size 5 colors kit in a box from China for $4.75 that should be here second week of Jan.

If you need an LED anytime soon, I'm your guy. I shall never go T1 or T1 3/4 LED hungry again!
 
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Old 12-19-17, 12:48 AM
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Funny... I ordered diodes from CA. Old radio shack stock... lady was nice and sent a little note in each order.... She has so much old RS stock its amazing the stuff is still out there... Cheap. 50 diodes for 4 bucks...
 
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Old 12-19-17, 12:52 AM
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And yet...RS still has an active site. I ordered some panel bulbs for my truck from them. Sure weren't that cheap though. Like buying from a store. Cheaper than $12 each at the dealer.
 
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Old 12-21-17, 10:20 PM
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Well, first 100 showed today...mailed on the 19th and he spent $.67 just on postage. I'm not complaining a bit and keeping this guys info for the future.
 
 

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