I have recovered the following data from Google's cache manually.
Please post any errors and corrections in a new post below.
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The format is:
Date, time, old postcount#, poster;
post data
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I will try to fix the CPF links in the next 2 weeks or until I give up in frustration. Can not do that and verify with CPF down.
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11-14-2010 02:23 AM #2 LEDliteengine
foxtrot824 said:
This is the beginning of of my small reading lamp build using the new Cree ML-E emitter in the 4000K flavor. According to the data sheet on these guys they will put out 60 lumens at 175mA. I am planning on wiring up 6 of them 2p3s and running them on a 350mA driver. Let me just say that even though the data sheet says how small they are it is difficult to appreciate how small small is until you have them in hand. They are about the size of and XP-G/E size diode but thinner. The first step will be to source some small stars or boards to reflow them to.
Since it was a nice fall day I took some before shots of the emitters out doors.
Updates to come as the parts come together.
ML-E is small, but have you seen and tested Nichia NSxx157 LED. Much smaller package than CREE MLE. I got the info from Nichia web site and searched for 157. Got few samples and nice performance LED in a very small ceramic package
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11-14-2010 01:16 PM #3 ledaddiction
Cant wait to see your progress post, good luck bud!
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11-28-2010 07:43 AM #4 foxtrot824
So it continues
Reflow soldering these little gems was a task, especially since I am still using the side of the iron as a hotplate to cook with. Lucky for me I only had 6 to solder so it didn't take that long.
Because I did not have a 150mA driver I did some parallel wiring which is not preferred but worked for the time being. 2p3s
I used Arctic Silver epoxy to secure the LEDs to the copper and obviously some electrical tape to keep wires in place. I think the finished product will have some type of diffuser over it to cover the guts.
The LEDs are driven by a 350mA driver so that each die sees about 175mA for approximately 60 lumens per emitter output. That makes for a good 360 lumens from this 4"x4" piece of copper.
Not bad for something that has almost no thickness.
