brightest 5mm leds without a metal heatsink?

LEDBE
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mpteach

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May 24, 2005
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What is the brightest 5mm leds without a metal heatsink? How many lumens could i expect?

Im adding some lighting to my new o1maxima flipkey/remote.
http://www.candlepowerforums.com/vb/showthread.php?t=245521

I might be able to have a new bottom case machined out of aluminum but i dont think im going to do that. I could just drill two holes in teh plastic and place dual 5mm leds on the front right side, remove the spacer below the remote guts and fit 2 x 2450 primary coincells, or rechargables or maybe a lipo instead.

I dont like how my lighthound 2x2016 5mm coincell fauxton light shines light backwards into my eyes.
 
I'd have to say the Nichias like in the Fenix E01. Expect about 10 lumens.
 
TorchBoy said:
An unmounted XP-G is about 4.9 mm across the diagonal... :devil:
Click to expand...

about??? about? wheres the +- manafacturing tolerances and the ambient temperature and presure you measured it at.....

the fenix does have heatsinking.

so two 5mm will give me 20L total continously?

How is the tint on that nichia?
 
Funny isn't it? A XP-G/XP-E package is smaller than a 5mm LED. They are so small with such a tiny surface area that they might need heat sinking when driven over only 30ma.

For the OP, I'd seek out the Nichia GS 5mm LED. Problem is availability. The Energizer keychain squeeze light has the GS in it if you can find that. ($3 at Target). These seem to be a cooler tint (b bin?). The c bin is overall a warmer "cool" white. The GS is the brightest 5mm LED I know of, but it has an angry blue center to the beam.

I have a few GS LEDs by recovering the LED from the light when the batteries run down. It costs more to buy new batteries for it than just to get a new one. If I need A76 batteries, I'll just buy the light and remove the batteries because a 3 pack of batteries is almost $6.
 
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I could put a strip of metal down the the right side to spread the heat over a larger part of the plastic case which would help some.

I dont mind if the light is a little bit blue i just dont want it very noticeably blue.

whats the ratio of ma to lumens?
 
I have some of the highest bin GS leds if you want a couple for your project for free. Just send me your email address and I'll mail them to you at no charge.
If anyone else wants some for a project let me know what you will be using them in and I might give you some as well for a small project. I think I have less than 20 left. I would like to see the completed project.
 
R@ndom said:
5mm leds are measured by cmd. And Nichia gs is vaguly 40000.
Click to expand...

doesnt cmd depend on viewing angle? What is the viewing angle of the lighthound fauxton? that angle is acceptable, except for the small fraction that backsatters to my eyes.

Im thinking about doing this project as fast as possible so im going to build it the easiest way with available parts. I can always swap a nicer tinted bin led or upgrade the batteries later or maybe even go crazy and have the case machined from aluminum and put a xp-g in there, but i shouldnt wait longer now.

Im thinking about using 2x2450. I dont know if that would burn up the dual leds direct drive since those can push alot more current than 2016. Actually is there a small regulator that would be good to use?

Im also considering li-ions coin cells which would give me a flater discharge curve or even 1 or 2 thin lipo packs.

What kind of voltages/current do i run these nichias at??

As far as the UI im only intersted in pushing a button for it to go on and pushing it again to go off, either a mechanical clicky or an electronic button like the fauxton. I dont need momentary on either.
 
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Er

Thanks grumpy pm sent

yea its mcd not cmd

What is the viewing angle of those GS? I'll take them anways im just curious.
 
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What voltage do those nichia GS run at? will 2x2450 burn out dual gs? IF so is there a very small regulator available? Would a lithium polymer battery provide the correct voltage? \

I dont like when lights are intially bright and rapidly dim.
 
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The GS at 20ma is around 3.18v
At 30ma it is 3.26v
Don't know about the batteries.

At 40ma I did not notice fading after 192 hours of continuous operation.
They probably can handle 50ma with good heat sinking of the leads (especially the cathode). Nichia uses a copper lead frame which helps. Most 5mm LEDs have tinned steel leads.
 
How can i tell if the led is starting to overheat?

The coincell datasheets that ive found are useless, they only cover really low current discharges.

I believe im going to use a LiPo pack anyways.
 
JohnR66 said:
I was looking at their 5mm 18cd "low degradation" white LEDs. They want $40 something for ten of them! Who do they think they are? Radio Shack?
Click to expand...
Link

Actually each "item" here is 10 pieces, so that's 100 pieces for $40.90. Still a little high IMO, but not bad.

If the specs are correct, then these achieve ~70 lm/W at 20 mA. Pretty decent although obviously not as good as the best power LEDs.
 
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