Samsung LM561C Leds

cobshopgrow

Well-Known Member
Hi Guys, i didnt found anything about these leds here (search made for LM561C).
Even theyre quite small, they look promissing.

http://www.digikey.com/product-detail/en/samsung-semiconductor-inc/SPMWHT541ML5XAVMS6/1510-2145-6-ND/6569519

and similar from the LM561C line up

Rated at above 200 lumen/watt with the standard 0.3w rating this doesnt sound too bad.
Even one led itself is quite cheap you would need many and penetration wont go far i think.
Quite some cooling needed, while there something can be thought out, a PCB carrier is needed anyway.
 

frica

Well-Known Member
Digikey, Arrow and so on also sell Samsung H-Series Strips with top bin 561c like this one:
http://www.digikey.com/products/en?keywords=samsung SI-B8R11156HUS/
280mm one has 24 561Cs.
560mm one has 48 561s
QB304 has 304.


12,67 280mm ones are 1 QB.
QB was 75 dollar last time I checked.
So unless the strip is under 5,91 dollar, the QB is the better deal.

And you need to buy 100 280mm strips before it's under the 5,91 dollar line.
That's quite a lot.


The 560mm is cheaper than the quantum board once you're below 11,84 dollars per strip.
That's after buying 25 units.

The 1120mm is unwieldy and a lesser deal than the 560mm

Unless Digikey changes their prices.
 

ThaiBaby1

Well-Known Member
280mm one has 24 561Cs.
560mm one has 48 561s
QB304 has 304.


12,67 280mm ones are 1 QB.
QB was 75 dollar last time I checked.
So unless the strip is under 5,91 dollar, the QB is the better deal.

And you need to buy 100 280mm strips before it's under the 5,91 dollar line.
That's quite a lot.


The 560mm is cheaper than the quantum board once you're below 11,84 dollars per strip.
That's after buying 25 units.

The 1120mm is unwieldy and a lesser deal than the 560mm

Unless Digikey changes their prices.
not to mention the QB is much simpler to wire up than bunches of strips
 

nogod_

Well-Known Member
There are, however two main advantages to the strips...

Even better spread and your choice of color temps. For a veg lamp you may not need all those smds so close together on one pcb (or all 304 smds at all) in which case something like the samsung and bridgelux strips are a more attractive option.

You can also buy the strips any time you want because they are in stock ;)

280mm one has 24 561Cs.
560mm one has 48 561s
QB304 has 304.


12,67 280mm ones are 1 QB.
QB was 75 dollar last time I checked.
So unless the strip is under 5,91 dollar, the QB is the better deal.

And you need to buy 100 280mm strips before it's under the 5,91 dollar line.
That's quite a lot.


The 560mm is cheaper than the quantum board once you're below 11,84 dollars per strip.
That's after buying 25 units.

The 1120mm is unwieldy and a lesser deal than the 560mm

Unless Digikey changes their prices.
 

ThaiBaby1

Well-Known Member
There are, however two main advantages to the strips...

Even better spread and your choice of color temps. For a veg lamp you may not need all those smds so close together on one pcb (or all 304 smds at all) in which case something like the samsung and bridgelux strips are a more attractive option.

You can also buy the strips any time you want because they are in stock ;)
Stephen said there will be a plentiful supply in a few weeks, The QB's have some color options. You may be right about better thermal spread with strips.There has been talk of a 2 ft strip version of the QB's coming out.
 

frica

Well-Known Member
http://www.digikey.com/product-detail/en/osram-opto-semiconductors-inc/GW-JDSTS2.EM-HRHT-XX55-1/475-3181-1-ND/6182064

205 lm/w according to Digikey.

I think the 185 lm/w comes from the Duris beinged driven higher (relative to the LM561C) on the Osram datasheet.

Also according to Digikey Osram has a higher variance between LEDs. 33-42lm on test current compared to 36-38 lm for the LM561C
 

CobKits

Well-Known Member
i trust that steven and robin are using the best chips they can get their hands on. pretty sure there are some nichias in play as well
 
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