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I have tried everything under the sun to get rid of a gnat infestation and can honestly say the only thing that has worked was using Gnatrol WDG from Amazon or EBay. At first I was doing the lower end of dosage per gallon of feed and wasn't seeing great results. I got fed up and started to use...

Mine did pull through but all the tops were ass and too fluffy. Any area with single leaf nodes made poor nugs :(. Maybe just sativa things as cindysid says. It was GHS SLH - and sadly I've never had a good run with that strain. I say let her run to fin and reply back here. I'd like to have...

For what it's worth. I used to get 1 finger leaves on plants that got too much light or too much nutrients and pH was out of wack. I had a buddy who had 1 finger leaves and it turned out to be a light leak :(.

Maybe someone can figure this one out. Since I've bought this house (few years) it's always had horrible humidity inside. For example, right now it's 63F @ 65% humidity _outside_. In my house, not tent, just in my house any room it'll be 70~72F @ 32~35% Humidity. This ends up causing the RH in...

What water block are you using ttystikk?

Makes total sense to me now! :) Ok, so seeing as I don't have a PAR meter of sorts.. what distance do people normally keep their cobs at? For reference my tent is only 4' wide by 2' deep. I'll have six leds running horizontally down the 4' run. 2 heat sinks, 3 cobs per. Pretty much a line of 3590s.

Great explanation CobKits! Thanks!

From the graph Randomblame posted, it seems to be measuring Photosynthesis (absorption?) over PPFD.. and the graph lines are the ambient temps? So if I'm reading this right... I want to be between 77~86F for optimal photosynthesis. Where is this graph sourced from? I'd like to read more if you...

Excuse my old school way of doing things, but I've always been under the impression w/o CO2 you want to be below 82~80F or so. I'm all ears on any new information :)

Ordered 3x more CXB3590s along with a pair of HLG 1400mA drivers. Planning on running 6x 3590 @ 1.4A and according to the calculator I should be around 900 ppfd. I'm excited to try lowering my existing 3590s from 2.1 to 1.4A and watching my temps drop :). What driver are people using to run...

Woot, I hope I win! Thanks!

Whoa super cool! Where'd ya get those led strips?

Awesome! Thanks for the reply! You actually just opened my eyes to how I can achieve lower heat. Is there some sort of efficiency map vs current for the CXB3590 leds? Or.. How does one calculate the extra heat a given led would produce over the current range?

Gotcha.. for what it's worth I'm in a 2x4 tent now. 4 wide, 2' deep. So using your math, if I did half so.. around 4~5 leds sounds about right for a 2x4 tent. Back then I never passed using 600w hps and was happy with my results. Heat was a major issue for me with hte 600w hps.. so I could never...

Hi all, it's been a long while since I've grown. Back then used to be setup with a 600w HPS in a 4x4 tent. Things have changed for me and now I'm limited to a 2x4 tent. Heat was a problem back then so I opted for LEDs following some guides on here. I ended up with 3x Cree CXB3590 CD powered by...

Here's how I run the JAR file: On Windows Open command prompt Navigate to the folder where the JAR file is Run the jar file via: java -jar DIYCOBLEDCalculator.jar If you get something like: java is not a recognized command You need to add the Java.exe to your systems PATH variable. When you...

Awesome, thanks for the responses :)

Hi guys, I saw some pics of a few peoples led builds and growmau5. I ordered the rapidled 3x CXB3590 kit @ 3500k. This is going in a 4x2 tent. I know this isn't enough but will start with this and try to get 1 more kit to have a total of 6. I'm having a hard time finding the clear domed lenses...

Thanks for all the responses. I will start with 3 and then go from there. Very kind of everyone :)

Hi, if I plan on 2x CXB3590s 36v for now and plan on 2x more down the road. Can I use a HLG-185H-C1400B? And if so, would I wire them in series, including when I get the 2x more later? I'm asking because I see the listed voltages are 72 ~ 143vDC. And if the minimum I needed to sink was 72 or...