How many lumens does the Luminus Devices SST-50 J bin put out at 2.5A and/or 2.8A?

[Corvette6769]

Trying to compare LEDs advertised by different manufactures is like trying to compare apples to oranges, since they seem to all be rated at different drive currents.

I know that the Cree MC-E M bin is rated to put out between 430 to 490 lumens at 350 mA and between 753 and 858 lumens at 2.8A.

Likewise, the Luminus Devices, Inc. PhlatLight SST-50 White LED (color W57S) WJ bin is rated to put out between 500 and 600 lumens at 1.75A, up to 960 lumens at 3A, and between 1175 and 1410 lumens at 5A.

Since 5A is virtually impossible with a single 18650 cell and even 3A would be hard to sustain, does anyone know how many lumens the SST-50 J bin puts out at 2.5A and/or 2.8A?

 

[Th232]

They may have ratings at different amperages, but all power LEDs I've ever seen also have a relative output flux vs forward current graph, Luminus is no exception in this case.

In this case, according to the datasheet at 2.5 A you've got ~135% of the output you'd get if you drove it at 1.5 A, and ~145% at 2.8 A.

On a side note, note that with your MC-E numbers, the 430-490 lumens at 350 mA is driving the dice in series (each die gets 350 mA, total Vf is ~12.8 V) while the 753-858 lumens at 2.8 A is driving them in parallel (each die is getting 700 mA, total Vf is ~3.4 V).

 

[DM51]

Your question is about an LED emitter, rather than an LED Flashlight, so I'll move your thread to the appropriate section for you.

 

[Corvette6769]

They may have ratings at different amperages, but all power LEDs I've ever seen also have a relative output flux vs forward current graph, Luminus is no exception in this case.

In this case, according to the datasheet at 2.5 A you've got ~135% of the output you'd get if you drove it at 1.5 A, and ~145% at 2.8 A.

On a side note, note that with your MC-E numbers, the 430-490 lumens at 350 mA is driving the dice in series (each die gets 350 mA, total Vf is ~12.8 V) while the 753-858 lumens at 2.8 A is driving them in parallel (each die is getting 700 mA, total Vf is ~3.4 V).

Thank you for drawing my attention to the output flux vs forward current graph. I had never paid attention to those before. Same with the multi-die ratings (series vs. parallel).

 

[TriChrome]

Here's a topic that should show you how to calculate the numbers yourself:

http://www.candlepowerforums.com/vb/showthread.php?t=258443

 

[Corvette6769]

Here's a topic that should show you how to calculate the numbers yourself:

http://www.candlepowerforums.com/vb/showthread.php?t=258443

WOW! Thank you! I do not know how I ever missed that post in my search.:thinking: