ANC
Well-Known Member
That is the theory... it might be challenging doing the cooling to achieve these numbers.
New style Samsung LM561C Board
- Thread starter chuckduck
- Start date
nfhiggs
Well-Known Member
Not sure what you are looking at but this is straight from the LM301B Rev 1.0 data sheet dated 2017.6.26 on the Samsung website:
http://www.samsung.com/global/business/business-images/led/file/product/products/201706/Data_Sheet_LM301B_Rev.1.0.pdf
nc208
Well-Known Member
I believe your using an older pdf. The one I'm getting my stats off of is Rev 2.3 dated 2017.12.02.
https://www.samsung.com/led/lighting/mid-power-leds/3030-leds/lm301b/
https://s3.ap-northeast-2.amazonaws.com/global.led/file/resource/2017/12/Data_Sheet_301B_CRI80_Rev.2.3.pdf
nfhiggs
Well-Known Member
Thanks - looks like Samsung needs to clean up their site of old Rev docs...
karlsefni
Active Member
Good morning everybody,
Looking at grabbing some of the lt-s28 strips for my first DIY build. Any thoughts? Cheers!
boostedhonda
Well-Known Member
I just order two qb304 boards with and hlg240h 2100b from China through alibaba,hope they aren’t fake, ordered my cobs the same way and they were legit
nc208
Well-Known Member
I wouldn't use that older tech. Look at newer strips like f series.
karlsefni
Active Member
Thank you very much for the heads up. I am actually in Canada and just looking for models which are 1 foot with a decent spectrum currently in stock. Any recommendations would be greatly appreciated. Cheers!
nc208
Well-Known Member
What you want is this
https://www.digikey.ca/products/en/optoelectronics/led-lighting-cobs-engines-modules/111?k=&pkeyword=&pv1614=343&FV=fffc05e6,b89239,b893d1,b89d1a,b89d1b,b8b486,ffe0006f,ffece9af&quantity=0&ColumnSort=0&page=1&pageSize=25
however they have no stock and a quick search shows not many places have the 1 foot sizes in stock, Can you use the 560mm length?
PhenoMenal
Well-Known Member
potentiometers arrived today, ten of them (apparently its best to check with a multimeter to see which one is 'best')
I'm a multimeter newbie (only bought it cos i was getting the QB!), but seem to be reading it ok ... I have the red wire going into the "VΩ" socket, and the dial on "Ω" (@ 200K) ... all the way to the left = 0.0, and all the way to the right = between 91.5 to 105.2 depending on which pot. I'm not sure what reading would be ideal for this QB ... 100? 105.2?
Anyway are these potentiometers ("B100K") suitable for the QB? i have 2 x QB-304's powered by one Meanwell HLG-240H-C105A
Thankyou for helping me learn and understand!
I'm a multimeter newbie (only bought it cos i was getting the QB!), but seem to be reading it ok ... I have the red wire going into the "VΩ" socket, and the dial on "Ω" (@ 200K) ... all the way to the left = 0.0, and all the way to the right = between 91.5 to 105.2 depending on which pot. I'm not sure what reading would be ideal for this QB ... 100? 105.2?
Anyway are these potentiometers ("B100K") suitable for the QB? i have 2 x QB-304's powered by one Meanwell HLG-240H-C105A
Thankyou for helping me learn and understand!
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PhenoMenal
Well-Known Member
yep i was conscientious to get linear pots! Any idea which one I should use? the low 91.5 one? one around 100? or the highest (105.2)?
PhenoMenal
Well-Known Member
whoa, I nearly forgot about the resistor ... have already blown an LED on the breadboard by not using them lol
Anyway ive got 10 pots to play with so i won't mind losing a couple on the breadboard to try to get my head around it!
Anyway ive got 10 pots to play with so i won't mind losing a couple on the breadboard to try to get my head around it!
PhenoMenal
Well-Known Member
regarding the potentiometer and resistor, I just threw this image together as this is what i'm guessing i need to do ...
Does it look right??? (and does it matter whether the resistor is on Dim+ or the Dim- line?)
ps. currently im running it with both Dim wires exposed, ie @ 100%, and obviously that's without a resistor ..... do we only need the resistor simply to prevent the LEDs being turned down too LOW? (what would happen if i just ran it with a pot but no resistor?)
Does it look right??? (and does it matter whether the resistor is on Dim+ or the Dim- line?)
ps. currently im running it with both Dim wires exposed, ie @ 100%, and obviously that's without a resistor ..... do we only need the resistor simply to prevent the LEDs being turned down too LOW? (what would happen if i just ran it with a pot but no resistor?)
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