Efficiency of Samsung LM561C diodes?

[ANC]

Shop around on Alibaba maybe they have decent 40mm LED extrusions now....

 

[magus66]

57% effeciency at 150mA and while maintaining 25°C.

Curious as I am - may I asked how you come up with theses numbers?
Second, 150 mA is about a 1/10 of the current named in the data sheet (1120 mA). I couldn't imagine that the LED will start shining at all at... interesting.

 

[magus66]

@ChiefRunningPhist I am sorry, my mistake with the current - I thought of the whole strip...

 

[KonopCh]

Curious as I am - may I asked how you come up with theses numbers?
Second, 150 mA is about a 1/10 of the current named in the data sheet (1120 mA). I couldn't imagine that the LED will start shining at all at... interesting.

This is current per diode.
Just look into Samsung calculator on their site and you can play with numbers.

 

[ANC]

One more picture, I couldn't resist.