Sol-Skin, let the journey begin...

K

key4

Well-Known Member
540 lm561 for £80??..Am i reading that right? that nearly twice as many as the qb for £20 more and they dont need a heat sink? Is shipping to the uk expensive for 4 boards thanks.

  • Channel 1 is 270 pcs of Samsung LM561C S6 bin 4000k

  • Channel 2 is 270 pcs of Samsung LM561C S6 bin 4000k

  • Channel 3 is 54 pcs of Cree XQE Deep Red 660nm(no deep red channel on this version, veg only)
 
legalcanada

legalcanada

Well-Known Member
it says below 100 watts doesn't need sinking. im new to LED and don't really understand, but it says those 540pcs run at 113w but the 300 on a QB can run 160w, so i imagine you could run this board higher than its saying or?

also i can't find anywhere if it says, what are the dimensions of each board?
 
jonsnow399

jonsnow399

Well-Known Member
legalcanada said:
it says below 100 watts doesn't need sinking. im new to LED and don't really understand, but it says those 540pcs run at 113w but the 300 on a QB can run 160w, so i imagine you could run this board higher than its saying or?

also i can't find anywhere if it says, what are the dimensions of each board?
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300x300 mm, I really doubt that Mark is selling a 540 diode board for $100.
 
legalcanada

legalcanada

Well-Known Member
yeah seems weird because adding the 54pc cree doubles the price, unless those diodes are 10x the price of the samsungs
 
tomate

tomate

Well-Known Member
@welight

Current Balanced:

Many mid power led boards take the low cost approach(series/parallel structures) and provide no protection for thermal runaway or current hogging and often create variable light levels from board to board or even string to string, this is often the result of mismatched voltage bins or worse case, partial string fails which result in the strings re sharing the current load across the remaining strings meaning variable light levels and changing thermal dynamics on the board, Well designed heatsinks may account for such possible variations but if not the boards life may be reduced and will impact PPFD.

The Sol-Skin boards have resistive structures that remove this issue by balancing the forward voltage loads. This means if you have 1 or 4 boards in your build each led will be driven exactly the same and any led failure will not result in current sharing.
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Those resistors can only prevent a thermal runaway between boards if they are wired in series but not in parallel, right? But if wired in series there is never a risk of a thermal runaway at all. So all what these resistors are doing is protecting the parallel strings of leds on each board making it possible to mix up different voltage bins, right?
 
H

HenrikB

Member
this very interesting to bad you didnt include a 4th channel with far reds (730nm)

any par readings on a 4x4 area?

witch erp drivers do you recommend for this board?
 
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welight

welight

Well-Known Member
tomate said:
@welight


Those resistors can only prevent a thermal runaway between boards if they are wired in series but not in parallel, right? But if wired in series there is never a risk of a thermal runaway at all. So all what these resistors are doing is protecting the parallel strings of leds on each board making it possible to mix up different voltage bins, right?
Click to expand...
correct most thermal runaway is parallel string related to uneven vf across leds or even different voltage bins, our design removes that risk
Cheers
Mark
 
welight

welight

Well-Known Member
HenrikB said:
this very interesting to bad you didnt include a 4th channel with far reds (730nm)

any par readings on a 4x4 area?

witch erp drivers do you recommend for this board?
Click to expand...
Far Red seems to be a spectrum required on a limited basis ie emerson effect, our full spectrum version uses leds that run to 840nm in the 5730 footprint so could be a solution or perhaps just a supplemental board can be added, be interested in your thoughts why you think a whole channel for Far Red makes sense?
Cheers
Mark
 
H

HenrikB

Member
I think the 3rd channel of 45 volts is to much photo red (660nm) when i look at your spectrum half would be enough . So if you split that to 2 channels that would be cool and then you can have the second half for blue or something.

I dont think you need a 45v channel for far red (730mm) not even half of it just 3-5 % of the effect of the whole board. far red in the board would be nice since when you add it outside if you use a board like the one you sell with 3 leds on it it will end up on the side and dont get a even spread. if you use single leds you put them around the panel and you need a few and have to modify your mountings for it.... all in one would be great ;) what would you need 4-8 cree xpe in there to get 3-5 %?
 
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