Thoughts on the Zeus 308 board?

Randomblame

Well-Known Member
Yea, if you buy from digikey you need to add at least 19% VAT. Shipped from germany within the eu there is no additional VAT or custom fees to pay.
 

wietefras

Well-Known Member
We knew already that the lumen to par conversion for these LM301B smds is higher than for LM561C (ie you need more lumen with the 301 than with the 561 for the same PPF), but it's funny to see how the lumen to PAR conversion changes when they ramp up the watts.

ZEUS 308 3000k par conversion table.png

ZEUS 308 3000k par conversion chart.png
 

Stephenj37826

Well-Known Member
All lm301b are not the same bin as ours. Plenty of lower bins around. HLG gets the best of the best from Samsung direct. Our same leds are not available to distributors or manufacturers. We have a special arrangement with Samsung
 

wietefras

Well-Known Member
Well they use 7% more of them and still charge less. Plus these boards seem to test at higher efficiency. That's before the inevitable wall losses that these big rectangular boards suffer from.
 

Stephenj37826

Well-Known Member
Well they use 7% more of them and still charge less. Plus these boards seem to test at higher efficiency. That's before the inevitable wall losses that these big rectangular boards suffer from.
I can buy 7% more of any led for the same price or less if I buy a lower bin. We pay a premium for the very best but I guess that doesn't matter.
 

wietefras

Well-Known Member
I can buy 7% more of any led for the same price or less if I buy a lower bin. We pay a premium for the very best but I guess that doesn't matter.
Not if the end result isn't actually "better" no

So this "better" bin is apparently not "better" enough to actually matter. You might be talking about 0.0001% "better" for all we know.
 

Stephenj37826

Well-Known Member
Not if the end result isn't actually "better" no

So this "better" bin is apparently not "better" enough to actually matter. You might be talking about 0.0001% "better" for all we know.
Sounds like sphere tests are in order. All I can tell you is it's ~5% better currently which means you will need around 50% more leds at any given wattage to match the efficiency vs available Lm301b ...
 

Stephenj37826

Well-Known Member
Well, that's just it, the Zeus 308 test data looks better than those for the QB288 v2.
Is this sphere verified or data sheet? Also at what temperature? If this is flash data with no driver losses then no it's not better.

Would be nice of them to share the actual sphere data from an accredited lab.
 
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Stephenj37826

Well-Known Member
Also it would be very surprising for Samsung to lie to us especially since they make these for us.... Idk seems odd to me.
 

Airwalker16

Well-Known Member
Should be these yes. Check the datasheet for additional info.

this is an overview you could find helpful about led strips
http://ledgardener.com/diy-led-strip-build-designs-samsung-bridgelux/
I am using EB2 560mm at 350-400mA each without heatsink, I am flowering in a 3ft-90cm height
Are these 560 strips bare or heatsinked that you're using? Very interested in these 560mm 2000+ lumen boards for $6.50. Max out at 1.4 amps but I'd think at 1050mA it'd be fine with no heatsink at all. I wonder if they can run at 1.4 bare? Or at least with just some GOOD air circulation in a tent or something. Constant air exchange 3-5x per minute let's say.

https://www.digikey.com/product-detail/en/bridgelux/BXEB-L0560Z-35E2000-C-B3/976-1734-ND/7907663
 

nfhiggs

Well-Known Member
There's cheaper $6 boards of that exact same one.
The $6.50 EB strips are not the same. They are only 2000 lumens while the Vesta strips are 3192 lm (2700K) + 3352 lm (5000K) for 6544 total lumens for just $3 more. They are actually a pretty good deal if you don't mind the lower efficiency.
 
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