New style Samsung LM561C Board
- Thread starter chuckduck
- Start date
Serva
Well-Known Member
Bridgelux EB strips are avaible with 1ft length.
karlsefni
Active Member
Thank you kindly sir. Would you be talking about the earlier EB strips or the 2nd gen?
Serva
Well-Known Member
I don‘t think gen1 are still avaible, but they are both made as 1ft.
Serva
Well-Known Member
Just read this... just go with 2ft. And I would prefer Bridgelux EB strips (gen2) over F-series, but that‘s my personal opinion.
PhenoMenal
Well-Known Member
btw im running 2 x QB-304's off the one driver, so is the B100K potentiometer still the right one for that or do i need B200K or...?
Potentiometer depend on number of driver, not on number of cob or board. So 1 driver needs a 100k pot, 2 driver dimmed from same pot needs a 50k pot, 3 driver from same pot needs a 33k pot and so on
Divide 100 by the number of driver and you will find right pot
PhenoMenal
Well-Known Member
sweet, thankyou! 
Finally got my drivers in and connected up these ebay QB boards. The board and driver are attached to a 9"x12" aluminum plate. My Killawatt meter shows 153W, and the max temp is about 50C with no airflow. Pretty sweet! No PAR measurements yet as it's getting late...maybe tomorrow.
PhenoMenal
Well-Known Member
just to clarify (my wattage meter hasnt arrived yet) is that for 1 x QB-288 ? (288 x 0.5w = 144w, add ~10w for driver overhead so im assuming thats about right)
nfhiggs
Well-Known Member
Why? 560mm length is perfect for a 2x2. Gives you uniform coverage all the way out to the edges.
Yep, that's 1x "QB-288". I was surprised by how well it dissipates heat with no heatsink... well I suppose the driver housing is sort of acting as a heatsink. Still can't believe how bright these boards are.
PhenoMenal
Well-Known Member
There's a lot brighter ... just not as efficient
'nology! gotta love state of the art!Ok, finally got a chance to take PAR measurements. These were measured in an open area (i.e. no reflectors). Killawatt meter shows 150W at the wall. Units are umols/m2/s, in case it isn't obvious.
Does anyone have a PAR map for a single HLG QB288? I looked around but haven't been able to find one. Would be interested to see how this board compares.
Does anyone have a PAR map for a single HLG QB288? I looked around but haven't been able to find one. Would be interested to see how this board compares.
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Moflow
Well-Known Member
Here's a par map of Growgreen Board 384 diodes at 151 watts in open space to compare.
Here's Quantum Boards par maps. 2 x boards.
.Unfortunately I can't find the single qb par map at moment but hope this helps
Now lets see par map of both at same distance to sensor. which one better above ? cant tell
Moflow
Well-Known Member
I can't at moment as the par meter is out at a friends
I've 2 QBs, one 135 watt qb here but never got around to measuring it in an open space .
Guess the 260 watt dimmed down some would be a frost maker !!