V
Victor Roberts
- Jan 1, 1970
- 0
DigiTimes.com is reporting that Lumileds has reported a
record 115 lm/W for a white power LED.
A device operating at 350 mA and drawing 1.2 Watts generated
136 lumens of white light at a CCT of 4865K. 136 lm divided
by 1.2 Watts gives 113 lm/W but the story states 115 lm/W so
there must be some small round-off errors. The CRI is not
given and I can't find any information about this LED on the
Lumileds web site.
This is much better IMHO than the 131 lm/W reported by Cree
last June since the Cree device was a very small, low power
LED not suitable for general lighting applications.
All the normal caveats apply. This was most certainly
measured at a junction temperature of 25C, is certainly the
best device they have produced to date instead of typical
data for the batch and may even be an unpackaged chip.
However, this is still outstanding performance, and the
performance should remain quite good even with when the
junction temperature is at a more reasonable steady state
value.
I'm looking forward to the announcement of products that
include the new technologies that made this achievement
possible
I'll be attending the DOE's annual LED Workshop next week in
Phoenix. Hopefully we will learn more about this device at
that meeting.
--
Vic Roberts
http://www.RobertsResearchInc.com
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site without written permission.
record 115 lm/W for a white power LED.
A device operating at 350 mA and drawing 1.2 Watts generated
136 lumens of white light at a CCT of 4865K. 136 lm divided
by 1.2 Watts gives 113 lm/W but the story states 115 lm/W so
there must be some small round-off errors. The CRI is not
given and I can't find any information about this LED on the
Lumileds web site.
This is much better IMHO than the 131 lm/W reported by Cree
last June since the Cree device was a very small, low power
LED not suitable for general lighting applications.
All the normal caveats apply. This was most certainly
measured at a junction temperature of 25C, is certainly the
best device they have produced to date instead of typical
data for the batch and may even be an unpackaged chip.
However, this is still outstanding performance, and the
performance should remain quite good even with when the
junction temperature is at a more reasonable steady state
value.
I'm looking forward to the announcement of products that
include the new technologies that made this achievement
possible
I'll be attending the DOE's annual LED Workshop next week in
Phoenix. Hopefully we will learn more about this device at
that meeting.
--
Vic Roberts
http://www.RobertsResearchInc.com
To reply via e-mail:
replace xxx with vdr in the Reply to: address
or use e-mail address listed at the Web site.
This information is provided for educational purposes only.
It may not be used in any publication or posted on any Web
site without written permission.