Introducing CobKits.com - specializing in DIY and Citizen COBs

CobKits said:
-almost all of the popular meanwells dont dim below 10% anyway, regardless of what type of dimming you use - easily verified by datasheet. you dont "lose" the bottom 10% as it doesnt dim below 10% whether you give it 1K ohm or 10K ohm

youve already demonstrated that unlike many hundreds of actual growers out there you dont understand how to safely use a low voltage power supply to wire LEDs in parallel - you are simply incapable of understanding how this can be accomplished despite everyone's best efforts to explain the very simple concept of matching a driver to a COBs voltage range.

in this thread youve also demonstrated you have no idea how drivers and chips work in regard to forward voltage
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You just continue to give bad advice.

Example: "as it doesnt dim below 10% whether you give it 1K ohm or 10K ohm"

I just tested an HLG-40-54B driving two BXEB-L0560Z-35E2000-C-B3 in series.

I was able to run them below 5 mA (0.06%) both with a resistor and a DC voltage. The LED strips were unstable at 3.5mA
With a voltage of ≈0.15v
With a resistance of ≈1,200Ω I first used a 3KΩ and then added a 2KΩ 5% resistor.
Going below 3.33 mA the LEDs turned off (0.04%).
CobKits said:
you dont "lose" the bottom 10% as it doesnt dim below 10% whether you give it 1K ohm or 10K ohm
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I have one running at less than 0.06% and you say you can't get an HLG below 10% with resistance and voltage? What's your problem?

CobKits said:
in this thread youve also demonstrated you have no idea how drivers and chips work in regard to forward voltage
Click to expand...

Correction: I've demonstrated how things work and/or are supposed to be done. You demonstrated you do not understand.



_________________________________________________________________________________

Test Setup
Upper Left: Bench adjustable power supply to vary the dimmer voltage 0-10 VDC
Center: resistors connect to the HLG dimmer wires in Panavise.
Lower Righ: , current shunt to measure current and the two EB Gen 2 strips lit very dimly.

grow lights 025.jpg


Two Resistors on HLG Dim wires.
Bottom Center to Botton right, EB Gen 2 Strip very dim @ less than 5mA.

grow lights 023_resistors.jpg
 
PurpleBuz said:
that only works with meanwell drivers that have the "smart dimming function"

e.g. HLG-240H-36D
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You are correct. I was wrong, haste makes waste. The Mean Well Australia site said "0-10 V Dimmer" available from their distributors. No part number, just a small photo.
The DAP Dali dimmer also looks the same but it's 0-10v PWM.
I use a dirt cheap Atmel Attiny417 which has a DAC.
 
6% or 10 % is just splitting hairs. Your on a growing site trying to justify your electrical engineering knowledge and none of us could give two shits less about. Your in the wrong section of the Internet attacking a well respected vendor in his own thread.

Make your own thread or go to a site dedicated to LED light building and argue over there.
 
Ginger Viking said:
Lookout @ChaosHunter looks like you are the next one to get picked apart.
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I could care less. Most of us on here MacGyver or Outlaw engineer our setups. To argue over a Watt, Par or Ohm in a pot growing form is meaningless to us honestly.

If I ask any of the vendors here what I need for a given space I'm going to get recommendations and go from there. My QB304s on a HLG 120h-1400a driver dims down to 75w and goes up to 185w, it does all I need it to do for my given space and grow style.

I'm sorry but @GrowLightResearch be leaved knowledge is irrelevant and just not needed or wanted here.
 
15170042909552037503174.jpg The 2× 200 watts led that I hack give me
More lux at 18 inch then my 400watts vl timber grow light I back the hack led up to 24 inch to have the same number
60 000lux

But the timber is spreading the light more evenly .15170028256111585843782.jpg
 
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Here is my next project waiting on the
Citezen1212 clu048 gen5 3000k 90cri to replace those epistar
2 × 300watts fixture 6 cob
@50watts each cob
20180127_154842.jpg 20180127_154848.jpg 20180127_154909.jpg 20180127_154941.jpg 20180127_155035.jpg
Right now they pushing 30 000lux at 18 inch with the citezen it will double that at 24 inch !!!
 
Will an hlg600 36a run 32 1212 cobs? Will 2 1212's with holders fit on a single 120mm heatsink? Does this sound like a good setup for a 16 square foot area?
 
I know they aren't drilled and tapped for two cobs. What im asking is, can i make 2 cobs fit on a 120mm heatsink? What about 140 mm heatsink?
 
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