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Warm deal on blue LEDs

D

dp004i

Golden Member
www.eled.com has decent prices on 3mm (very hard to find) and 5mm blue LEDs. Shipping is kinda high, since they use UPS. That's not too bad though; their blue LEDs are $1.50 each, while Radio Shack wants $5 for the same thing.
 
note: places like mouser.com digikey.com goldmine-elec.com all have 3mm blue LEDS

all ship UPS style too I believe.
The kingbright (at mouser.com) 3mm will work off the motherboard pins (its at mouser.com)
The kingbright 5mm won't though 😱

good deal 😱
Heres a link to the highest brightness LED page: here
 
There was an article on dc.ign.com a LONG time ago where they showed you how to replace your Dreamcast orange LED with a blue one (or any other color, although blue says SEGA). 🙂
 
Dont forget your local frys has blue LEDs too. Both the 3mm and the 5mm work off the motherboard. They are a nice violet-blue color instead of the royal intense blue color. The 3mm is $2.29 and the 5mm is $3.99.
 
I got some there (www.eled) a couple of weeks ago. 10 blue, 10 red, 5mm water clear, super bright, the total came to under $20 shipped.
 
not trying to pedal my own stuff here but I have lots of these 5mm LED keychain lights in blue, red,green & yellow. I am asking $3.00ea plus shipping (i think it was .57 each but cant remember now) and i can give quantity discounts.

Mods If this is in anyway aginst the rules sorry and please delete it!
 
Why is it that blue leds always seem the brightest in these pictures?

I thought that green leds were actually the most brightest? They typically output the greatest luminosity out of RGB. But I also heard it has something to do with the human eye's sensitivity to green light.

So when trying to buy a LED flashlight, do you get a red, green, blue or white one?
 
Does ELED.com carry the surface mount LED for the digidoc in blue??? i checked out all of the surface mount ones but didnt know exactly what the specs were.. if someone knows post it... it would be soooo CHEAP compaired to everyone else.. thanks again for this link..
 
foggy,

Not sure why blue looks brighter to you in the pictures. Probably depends on a number of factors like distance and orientation when shot was taken, what the frequency response of the film or CCD is and what sort of post processing was done to the image. The human eye is most sensitive to green so for an equivalent mCd output of red, green, and blue the green appears brighter, or if you mix the light (shine all three on a white background) it will have a greenish tint to it.

For a more complete explaination of luminance see theledlight.com which is a good source of discrete LEDs of various types in smaller quantities (there now this post isn't OT 🙂 ).

This explains why you can get white by mixing yellow light with blue. If the yellow and blue are not pure monochromatic sources then they overlap and reinfoce each other in the green part of the visible spectrum. You get a white light that is lacking in some red hue, hence it looks a bit blue or cold. I believe this is how the GE white LEDs work. They use blue LEDs with a yellow phosphor mixed into the epoxy used to encapsulate the device. The result is a white light that has some bluish tint to it.

I think all white LEDs use some sort of composite generation technique since, as far as I know, nobody has figured out how to generate wavelengths that will mix to give white on a single substrate material. At least I've never seen such a thing available commercially.

Max L.
 
The brightest LEDs are currently the Luxeon LEDs made by Lumileds (some org created by Agilent and Philips). For these, the Red and Amber are the brightest, white the dimmest, blue/green/cyan somewhere in the middle. You might want to check out the Candlepowerforums if you're interested in this sort of thing.

The Luxeon LEDs are equivalent to around ten typical nichia high-output LEDs.

Candlepowerforums
 
I just got some 5mm Blue Leds from Radioshack for 2.99, they are 3.7 volt, 20mA, 2600mcd so they are actually brighter than Eld's just a tip depending on how much UPS comes out to.
 
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