Best *Quality* white LED's ?

DaveH

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Best *Quality* white LED\'s ?

OK, since HDS still has their lights on backorder, I'm going to bite the bullet and make my own light.

I want to buy 25 or so white LED's, highest output, narrowest angle, that are reasoably available. Price is less of an object, quality is more.

I've have bought some LED's in past that I wasn't very happy with.

Any experiences?

Thanks,
DaveH
 

Brock

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Re: Best *Quality* white LED\'s ?

I beleive Hosefelt sells the Nichia 20 degree 5600mcd LED's, but I can't seem to find them now. You can also find them at http://www.bgmicro.com/pdf/page7.pdf they are right in the middle of the page.

Let us know what you build and how. I was thinking of 3 AA cells and 18 of the white Nichias. I just never seem to have time to try it.

Brock
 

DaveH

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Re: Best *Quality* white LED\'s ?

I was thinking of a 3 C Mag-Lite, and as many LED's I could fit in the lens.

DaveH
 

Brock

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Re: Best *Quality* white LED\'s ?

Ohhhhh, I like the sounds of that. It has a nice size head on it. I bet you could get at least 12, probably 18 in there. That would be really nice! I will buy the prototype
smile.gif


Brock
 

DaveH

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Re: Best *Quality* white LED\'s ?

I'll probably place an order for the LED's soon. I looked at the head of the maglite, and I think I'll need all the internal head space for the resister pack.

Otherwise, lights on the perimeter, etc. sound cool. BTW, BG micro has stoplight
LED modules forsale for like 4 bucks each with red/green/yellow leds.

DaveH
 

e=mc²

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Re: Best *Quality* white LED\'s ?

FWIW, I've attached 4 different photo's of my home made 3D mag with 18 LEDs in the head.

<img src=http://www.draucik.com/images/big_bopper.jpg>

Construction was relatively simple, I just purchased a bread board with the alternate rows of holes bussed together from Radio Shaft and soldered the LEDs in place. They are connected to the bulb socket via a PR type flange base obtained from smashing an old bulb and removing the guts with a soldering iron and solder extractor.
As you can see, it definitely stomps all over the trek 7, but I still like the trek 7 due to its durability and it can withstand the elements much greater than the homebrew mag can.

Regards

Edwood.
 

e=mc²

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Re: Best *Quality* white LED\'s ?

Don't know why it didn't work the first time, just relocated the images. My humblest apologies for the multiple post.

Look:
<img src=http://members.bellatlantic.net/~edraucik/images/big_bopper.jpg>

Regards, Ed
 
D

**DONOTDELETE**

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Re: Best *Quality* white LED\'s ?

I would be very curious to see a comparison of Ed's Mag conversion and a maglight using LED Corp's single LED replacement bulb. Certainly, one of the replacement bulbs is cheaper than 20 diodes. I suspect each has it's own merits. I just ordered the PR replacement from LED Corp and can't wait to try it out. Craig gave it a favorable review.
 

Badbeams3

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Re: Best *Quality* white LED\'s ?

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by KenB:
WOW!! Edwood...what can I say...that's GREAT!
Did you achieve the beam quality you were hoping for? Can you take pics of the beam against an object like Brock does and compare it to the trek 7 ? What type of led`s did you use? Would you use the same ones again if you made another one? What about a mixture of wide and narrow beam led`s? How much do you figure it cost to make it? How long of "high brightness" run time does it have before the batts start to wimp out.....I just love it! Now I want to make one!...I already have a 3 D cell mag light...I`m off to Radio Shaft...Bye!
<HR></BLOCKQUOTE>
Sorry about the big print folks. Guess I should have settled down before posting
smile.gif




<FONT COLOR="#000000" SIZE="1" FACE="Verdana, Arial">This message has been edited by KenB on 12-04-2000 at 10:07 AM</font>
 

K Horn

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Re: Best *Quality* white LED\'s ?

What type of LED's and what size resistor did you use????

It looks nice.
 

DaveH

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Re: Best *Quality* white LED\'s ?

Looks good! I'm thinking about getting a wire wrap tool to do the connecting up.

DaveH
 

e=mc²

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Re: Best *Quality* white LED\'s ?

Well, let me start off by saying that this wasn't a cheap project to undertake. I purchased the LEDs from theledlight.com as they had good pricing and they sell 18 for $51. They aren't as color matched as Nichia's, as I've ordered some from them in the past (wallet still sore) at $6 each. Total cost was $51 for the LEDs, the 3D mag I already had but they go for $20 at the local Sears Hardware store. The breadboard which they are mounted on was $4. Cost of solder + PR base was negligible (I have lots of burned out bulbs). So said total amounts to $75. Seeing that the HDS are hard to come by and are expensive (with all that circuitry), I ventured on this project. I am not using any dropping resistor, so I know that the LEDs must be overdriven somewhat, but what puzzles me is the total current draw on a fresh set of alkalines as measured by both my Fluke meters is only 505 ma or 28 ma per LED. BTW the white 5 mm LEDs are the 20 deg, 5600 mcd variety and they compare exactly to the Nichia ones. I will try to find a suitable target to photograph the beams against. Any suggestions as to the distance to the target?
I do not have much space as I live in a tiny cape cod house with not much room for "distance shots". My wife saw this and thinks I'm totally off my rocker. (Didn't tell her the cost though). Thank you for the compliments.
Regards
Ed
 

e=mc²

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Re: Best *Quality* white LED\'s ?

Using what little room I have in my work area, I photographed the beams simultaneously as my camera would have compensated for the difference in beam intensity had I taken these shots separately. The trek 7 is on the left and the mag 3d-18 is on the right. Both were 12" from the wall as measured from the leds to the concrete. The only alternative to close shots is going outdoors and taking the shots against my house but the current air temperature at night forbids that. (I hate the cold.)
<img src=http://members.bellatlantic.net/~edraucik/images/t7vsm18led.jpg>

Regards,
Ed
 

Brock

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Re: Best *Quality* white LED\'s ?

WOW, I really like it! The mA draw sounds about right with a 500mA load on 3 D cells. If you can, check the voltage of the batteries with the LED's on. I bet it is about 4.5v The Nichia are rated to 4.6 or 4.7 So you are more than safe. You could probably use 12 and get about the same light, but then you would be pushing the LED's more and the light wouldn't be as smooth. I think you did it the best way. Now you can sell them for $100
smile.gif
then you can tell your wife about them
smile.gif


So do you think you could get 18 in a 3 C cell MAG?

Brock
 
D

**DONOTDELETE**

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Re: Best *Quality* white LED\'s ?

WOW!! That's awesome! I'm really surprised at the relatively yellowish tint of the Trek 7 compared to yours. Yours has a really nice smooth, even beam. Looks blindingly bright, too. Good job.


<FONT COLOR="#000000" SIZE="1" FACE="Verdana, Arial">This message has been edited by pepopl on 12-04-2000 at 11:52 PM</font>
 
D

**DONOTDELETE**

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Re: Best *Quality* white LED\'s ?

Looking at the pictures your 3d-18 light is brighter and white beam of light is better than Trek-7's white-yellowish beam of light. Your light has wider and I presume will throw beam of light farther.

If space in your test area will allow can you shoot a photo comparison of 3d-18 and Trek-7 aimed to a target at 10 and 20 ft.?

Good job Edwood!!!


------------------
2d_edge
 

K Horn

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Re: Best *Quality* white LED\'s ?

Its really a sharp looking light. And I hate
to keep pumping you for information.....but it won't stop me<g>...

We all know on a mag that the bulb is secured in the base end and then the head is screwed down over it.... Your LED bulb array looks too big to have the head screwed down that way. So what magic wand did you wave... is it like one of those ship in a bottle tricks???

THANKS
 

e=mc²

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Re: Best *Quality* white LED\'s ?

In response to KHorn's question, I unscrewed the lens retaining ring off the head and inserted the circular breadboard through the top of the head. To get the breadboard circular in shape, I first cut a square piece off the breadboard that I bought at the shack, then I traced a circle on it using the lens as a guide. Since breadboard is too brittle to cut a cirle out using a jigsaw, I cut an octagon shape out first, then sanded it with coarse grit paper to shape it into a circle that would fit just right inside the head. That, I'll have to admit, was more time consuming than the solder job of 18 LEDs. To connect it to the light, I used a single twisted pair length of wire approx 3 inches long and soldered one end into the old bulb's PR base, then soldered the other to the breadboard. But be sure to thread the wire through the bulb's retaining ring before completing the solder job. I used wire instead of attaching the PR base to the board directly as this allows for screwing the head back onto the flashlight without twisting the wire.

I hope this provides some help. Since this is easily undone, I could provide some photos of it somewhat dismantled so you can see how it goes together.

Regards,

Ed
 
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