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Just get a 100k Ω Potentiometer connect the middle post to dim- (white) and one of the outer posts to dim+ (blue). If the light dims when you turn it up instead of down switch the blue wire to the other outer post. Edit: I don't use a 10k resistor and it works perfect 0-100%. should I add...

The Mean Well LPF-25D-42 (25Watt) can do 21-42Vf @ 600mA dimmable.

My suggestion for a dimmable, sealed driver. The HLN-40H-48*, It has a range of 28.8-48Vf @ 840mA max current. The * can be the A or B versions, B uses and external dimmer and A has one built-in. Also there is the -42* which can do up to 42 volts @ 960mA and there is the -54* that will do 54...

I dont know mc, that heatsink is pretty impressive. It looks overkill, which is right up my alley.

start by reading this https://www.rollitup.org/t/diy-led-grow-lights-with-cree-cxa3070-cobs-and-cpu-coolers.805681/ Its really not that hard and you will find help in these http://rollitup.org/t/diy-led-cree-cxa3070.789575/ http://rollitup.org/t/diy-leds-how-to-power-them.801554/ Hope that helps

@goud, thanks for the code but it has problems. I changed int outputValue = 0; to int outputValue_a = 0; int outputValue_b = 0; then it compiles fine but I actually cant control either fan with the pot. Fan_a on pin 3 gets 100% duty cycle and fan_b on pin 11 gets 0%. When I turn the pot...

So I was thinking I should start a thread here to keep some of my projects and ideas, More for me than anyone else but feel free to follow along. I am learning this electronics stuff and am by no means an expert but I will post what I figure out when I figure it out in case it helps others. I...

We'll maybe the distance had something to do with it, but I found a banana Day 42F. It was a Tahoe OG clone from craigslist, I was told it was a cali connection seed (I've heard they can herm). I noticed it on a bottom branch 12" down in the scrog canopy, definitely not a keeper. Vancouver...

mc130p, I was always hesitant and skipped over your thread because I had no interest in BD panels. I am glad I looked, there were some beautiful photos of top shelf buds you have be posting. I cant wait to see your party cup, also that heat sink is awesome. I just sent 6 feet of heat sink out...

And the award for being the first to bring up a commercial panel in a DIY thread goes to.. (Drum Roll please):wall::wall::wall::wall::wall::wall: @PetFlora and his BML SPYDR. Here he is now, comparing his $1000 Disco Light to the Cree Cxa3070 $1000 sure gets you a lot of COBs to spread and...

My ghost peppers were barely hanging on to life, I thought it was the soil,it was a Coco and Seasoil mix. I figured there was to much salts from not rinsing the coco enough so I changed them to some store bought mix. Out of 13 I have two left outside which are still struggling and one I moved to...

@maddmattmurdock Just to be clear, when I say 5000k and 3000k I am talking about the color temperature in kelvins where you seem to be using it as wattage. The CXA2520-0000-000N00Q435H is 3500K 80 CRI and so is the CXA1507-0000-000F00G20E6. All will work excellent for vegging. The unknown...

Awesome find, I am going to to assume you mean the 3070-0000-00N00Z450F. Those are 5000k 80CRI bottom bin chips, and though alot people here are flowering with cxa3070's, most are doing it with 3000k chips or a mixture of both. I would love those Z4 5000k for veg, but IMO your going to need to...

@Greengenes707 got his COB tested with a specroradiometer. I overlayed the line from the Cree Data sheet to his results and I couldn't get them to match. This was the closest and the grids don't line up. From this its seems we get more red maybe which would be cool. Also whats that over...

It seems he doesn't order from Cree directly..

"We can only order by order code, which encompasses a lot of bins." I assume they don't throw those lower bin chips away, I'm just pointing out that we don't actually know the bins of the ONYX or the Apache for that matter. The only commercial panels (that mater) we really know the bins of are...

salmonetin, I followed some of your arduino links trying to figure out the PWM for pc fans, Its harder than I though because of the frequency. I managed to get it to work by changing the frequency of D3 with code i found/stole from a few sites. I can control a few fans with this but only 1...

I could be wrong, but didn't they give us bin numbers then say that they cant always get those due to availablility.

No thanks.

I've been keeping my RW-150's between 7-8" with no I'll effects. They love it.