Developments in High Power LED

[NewBie]

Equally impressive results have been achieved for white LEDs fabricated using CREE's much larger XB900 chips, which have demonstrated a flux of 67 lm at 350 mA with an efficacy of 57 lm/W. At a higher current of 1 A, the efficacy dropped to 34 lm/W but the total lumen output was 142 lm...from a single chip.

http://www.ledsmagazine.com/articles/features/1/10/11/1

 

[MrAl]

All i can say is:

WOW WOW WOW !!! /ubbthreads/images/graemlins/smile.gif

This is great news, as there will probably be more
competition in the white LED arena meaning prices will
come down. Cant wait! I need to build about 10 more
flashlights :-)

A little off topic...
Talking about advancements, SpaceShipOne recently made it
into space twice within two weeks, without ONE SINGLE
EXPENSIVE HIGH TEMPERATURE TILE !!! Gee Nasa, maybe
you could learn something there? hee hee.
Ok, so the payload is much smaller...

Thanks again for posting.

Take care,
Al

 

[evan9162]

Competition is heating up. I can't wait for these newcomers to the high power LED markets to get their products out en masse.

 

[NewBie]

The new even higher efficiency CREE LEDs are already available for actual purchase, hit the streets this week.

You can purchase them now at www.etgtech.com/xlamp 310-202-6400(P)

You will have to ask for the 60lm/w whites, (btw, power input is ~3.2Vf @ 350mA). They also

 

[greg_in_canada]

[ QUOTE ]
MrAl said:
A little off topic...
Talking about advancements, SpaceShipOne recently made it
into space twice within two weeks, without ONE SINGLE
EXPENSIVE HIGH TEMPERATURE TILE !!! Gee Nasa, maybe
you could learn something there? hee hee.
Ok, so the payload is much smaller...


[/ QUOTE ]

Totally off topic /ubbthreads/images/graemlins/smile.gif now:

But a sub-orbital vehicle re-enters the atmosphere
with roughly zero velocity. The space shuttle re-enters
at 18,000 mph. So it's heating is much larger.

Some people have estimated that getting into orbit
and back is somewhere between 10 and 100 times as
difficult as a sub-orbital arc. Much of that is due
to the reentry heating.

Greg

 

[idleprocess]

Orbital elevators are the way to go for getting into orbit. No need to expend all that energy accelerating and decelerating excess mass. The technology is so very close now that carbon nanotubes can be fabricated in some quantity.

Anyway... I still want to see those Cree parts on the market.

 

[NewBie]

They are on the market alreadly for purchase idleprocess.

 

[jtr1962]

I personally find the efficiency improvements mentioned for 5mm whites more interesting since these usually precede the high power by a year or two. 82 lm/W and 92 lm/W with CCTs of 6000K and 4600K, respectively, makes this very, very interesting. This means efficiencies are well into the realm of linear fluorescent tubes, and we're within shouting distance of that magic 100 lm/W mark. Once Cree makes an XT-30 chip and puts it into a white LED we should be there. Given the year or two to go from lab to production, this should mean 5mm whites of 80 to 90 lm/W by 2007 at the latest (hopefully late 2005 if they rush these into production). 5.5 lumens from one little 5mm white LED makes these very useful. I can imagine super flux based on the same technology outputting maybe 13 or 14 lumens at 50 mA. Again, very useful. I wish I had some of these theoretical superflux LEDs for my taxi project right now-2600 to 2800 lumens from 200 LEDs would put my mind at ease as far as having enough output goes.