>> =A0I put before the LED guru's eyes the following to ruminate and
>> disseminate upon.
>>
>> http://www.epistar.com.tw/
>>
>> Epistar say they have produced a 110lm/W for 1W and 3W warm white
>> LED's. According to them the 1W offering has a CRI (hmm some sort of
>> index I suspect) of 90 @ 15v the CCT (I know that one) is 3000K


> Not bad, though the Cree XP-G Led's reach 139 lm/W
>
> http://www.cree.com/press/press_detail.asp?i=3D1241094842732


Slight beating of the data sheet indicated that that is at 3V and 350
mA, using the top R5 bin and NOT at the full rated 1A.
Note that at say 100 mA the l/W will be somewhat higher.
Flux per mA rises modestly with falling current and Vf falls with
falling current so you'd get maybe 150 l/W at 100 mA.
Nice.
Running the graphs in the other directiion shows it's going to provide
somewhwre under 120 l/W at 1A in.
Still very good.

Notice that they say it offers unprecedented efficincy for a *single
die* product.. I wonder which multi-die competitor they haven't yet
managed to catch up to?

Does anyone know pricing for the XR-G R5 bin?



        Russell

.



That's cool-white so a warm white version as per Epistar would be
somewhat lower.
Also Epistar seem to be trying to work some special CRI magic with
their multiple emitter wavelengths whereas a look at the XP-G's
spectral power distribution chart shows it is very much a conventional
blue LED plus single colour phosphor.

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