For those of you who are waiting for the
Lux rebel (200 lumans) rollout in LED
lights, they are having some problems
with them. Here's a thread I found on it.
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I think you are giving the Lumiled
morons way too much credit.
First they take the time to push the
state of the art up to new highs in
lumens/watt then package the Rebel in
this CRAPPY little poorly designed
asymmetric package.
The heat pad, that everyone is so
worried about is not only TINY, it
doesn't even cover the area that it
could on the bottom of the package! Gee,
that seems pretty stupid, doesn't it?
The electrical connection pads are also
quite TINY considering the 700mA to 1A
of current that you could be pushing
through them. This is made worse by the
fact that surface mount devices somtimes
get placed a little off center, which
would further reduce the contact area.
Also, they are all the way over at the
end of their cockeyed asymmetric
package, with only these skinny little
conductor tracks along the top of the
package to connect to the die. At a time
when others are adding additional bond
wires to lower Vf, why increase the
package resistance unnecessarily in this
way? STUPID AGAIN!
I can't think of a single reason for
cockeyed little asymetric package (other
than the fact that it's cheap to
produce), unless the Lumiled folks,
aware that CREE, and Soeul will be hot
on their heels with higher output chips,
figured that they would get clever and
come up with this tiny little package
that can be 'clustered' (so even if you
can't push any more lumens out of the
poor little rebel chip, you can just buy
three or four and jam them together in a
kind of Lumiled Cluster-F...).
A square or only slightly rectangular
package with about 20% more width than
the current rebel's narrowest dimension,
and with the emitter CENTERED and
contacts at the ends would be at least
as good thermally, and MUCH better for
most LED flashlight applications, which
use a SINGLE LED and where you have to
fit the emitter up inside existing
reflector designs.
For those who do need to 'cluster' the
rebel chips, or who already have
automated production set up for the
current design, Lumiled should obviously
continue to offer them, but with many
IC's and other semiconductor devices
already available in multiple package
types, I look forward to seeing the
Rebel LED die offered in a more
intelligently designed package.
So, for the record; I have worked with
the Rebels; Love the performance, HATE
the packageing.
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i can think of a reason, because its not
designed for a flashlight, it has a
higher purpose in mind, one that doesnt
use 1 light PER unit ?
that fits behind LCD screens and takes
100+ of them? that gets adopted into
some manufactured products ? that can go
into $4000 overpriced HDTVs? and it
takes 400 of them? that goes into some
goverment project, that breaks down
after 4 uses.? would you believe jumbotrons?
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A LCD screen that uses 100 plus - 100
Lumen LED's . . .
I want one!
Of course you might have to view this
10,000 lumen monster using welding
goggles, but that's a small price to pay
to be on the cutting edge.