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NewBie said:
Roithner numbers are have been subject to debate in the past...no surprises here.
On their web page datasheet, they are using the numbers for the ***RED*** LED not the white.
Another interesting thing you will notice is the ***up to*** numbers on the Roithner site...humm
For the Lamina part:
http://www.laminaceramics.com/products/bl3000.aspx
http://www.laminaceramics.com/docs/BL_3_Red.pdf
<font color="red"> Red:</font> 2045 lumens @ 104 Watts and --->25C LED die Junction Temperature<---
The junction temperature 25C thing is the same game LumiLEDs plays, which is highly unlikely in use, unless you are outdoors in Alaska in the winter...
It is nice that the white part dropped to 81 dollars:
http://www.mouser.com/index.cfm?&handler=data.listcategory&D=*BL32D00133*&terms=BL-32D0-0133&Ntt=*BL32D00133*&Dk=1&Ns=MfgrPartNumber%7c%7cSField&N=0&crc=true
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Quoting 25C junction temperature is even worse for AlInGaP (red/orange/amber) LEDs, since those materials lose output at high junction temperatures much worse than InGaN (blue/green/white).
At 100C Tj, InGaN output might drop to 75-80%, but AlInGaP drops to about 40%!
The Lamina has a thermal resistance J-Case of 0.56 C/W. At 104W, that's 58C above case, or best case of about 83C Tj. Which means output drops to 0.5, or about 1000 lumens. At 104W input, you're at less than 10 lu/W. Pretty bad for a red LED.
NewBie said:
Roithner numbers are have been subject to debate in the past...no surprises here.
On their web page datasheet, they are using the numbers for the ***RED*** LED not the white.
Another interesting thing you will notice is the ***up to*** numbers on the Roithner site...humm
For the Lamina part:
http://www.laminaceramics.com/products/bl3000.aspx
http://www.laminaceramics.com/docs/BL_3_Red.pdf
<font color="red"> Red:</font> 2045 lumens @ 104 Watts and --->25C LED die Junction Temperature<---
The junction temperature 25C thing is the same game LumiLEDs plays, which is highly unlikely in use, unless you are outdoors in Alaska in the winter...
It is nice that the white part dropped to 81 dollars:
http://www.mouser.com/index.cfm?&handler=data.listcategory&D=*BL32D00133*&terms=BL-32D0-0133&Ntt=*BL32D00133*&Dk=1&Ns=MfgrPartNumber%7c%7cSField&N=0&crc=true
[/ QUOTE ]
Quoting 25C junction temperature is even worse for AlInGaP (red/orange/amber) LEDs, since those materials lose output at high junction temperatures much worse than InGaN (blue/green/white).
At 100C Tj, InGaN output might drop to 75-80%, but AlInGaP drops to about 40%!
The Lamina has a thermal resistance J-Case of 0.56 C/W. At 104W, that's 58C above case, or best case of about 83C Tj. Which means output drops to 0.5, or about 1000 lumens. At 104W input, you're at less than 10 lu/W. Pretty bad for a red LED.
