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Still running the same soil but last year I started to run in to problems due to lack of runoff (my runoff worked its way up to 5000 TDS). So I took ALL my potting soil (9 years of use and reuse) and rinsed it thoroughly with rain water at 5ppm. About 15 gallons of water for every 5 gallon...

Its been a few years! I got into a bunch of other projects and neglected growing for the most part. I lost most of my cuts from neglect over time but still have a handful of good ones to work with. My recycled soil got worn out/out of balance so I stopped amending with ferts and left the...

@mduke pointed out that Cutter (THANK YOU Mark @welight ) posted the SPDs (based on photon count) for some of the most popular CXBs and it takes the bin into account, the 3000K 80CRi CB, 3500K 80CRi CD and 4000K 70CRi DB. I tried to adjust them to be relative to each other in this gif

It looks like I opened Pandoras Box the PM came in on some clones from Cali. I have got clones before with no trouble, so I was caught off guard. This indoor grow has never had PM in 7 years and the conditions did not change, so it was easy to figure out the source of the infection. It showed up...

Started on a mission in 2008 to test a bunch of different flavors to find out how much variety cannabis can really dish out. Finally got through 200 different ladies and these are the top 5% or top 10 that came from seed. These 10 have very strong but unique smell/flavor, great potency and at...

Working on building a new tent. 4'X8'X7', cut to size from Home Depot 2X3s, genuine Polar Bear plastic, 11 mil tarp for the floor. The polar bear plastic is very nice, matte finish on both sides versus the glossy plastic I got from HTG supply years ago. They advertise reflectivity and I can...

I have been meaning to do this test for awhile and finally got a chance last night. I used an Apogee SQ-120 PAR meter with the following correction factors provided by Apogee: CREE CX 3000K 80 CRi (divide reading by .952) CREE CX 4000K 80 CRi (divide reading by .97) CREE CX 5000K 70 CRi (divide...

There are many ways to do it but this is how I have been doing it for ~4 years, always a work in progress and open to advice. The idea is to get nutrients from many amendments so the plants and microbes have access to anything they need and all bases covered. Base mix: 20 Liters (1 bucket)...

This chart shows how many COBs you can fit on each driver. Hopefully it will save DIYers some time or give them some ideas. If the number of COBs is 3.93 for example, you could run 4 and you won't get the full drive current but you will get full driver efficiency. If the number is 4.1 that is a...

Depending on the cost, this might become the lowest hanging fruit at some point in the near future http://www.ledjournal.com/main/blogs/examples-of-optimizing-lighting-efficiency-with-glass/...

Time for me to retire the reds, deep reds, blues and CXA3070s. The first tent has been mostly converted to CXB and averaging 55% efficiency. The first run turned out 1.35gpw in ~60 days, best numbers so far for me but should go higher when the CD bins go in @ 64%. Kept the canopy below 80F and...

They sent me the updated 200W model to have a look at. Running a pair of Vero29 V2.0 4K at ~2.15A. Measured: Power draw warmed up: 186W on 120V -> 1.6A -> .98 power factor. Awesome Mean Well performance as expected. Temp droop ~3.5% Estimate: driver efficiency 91% drive current ~2.17A 169...

This LED forum has been accused of dogmatic unthinking parroting. I see it as a collection of very intelligent and helpful people sharing ideas and information freely, advancing the tech as best we can. But we are human, so put us together and naturally there is going to be friction. Lets use...

I received and tested the new version of the 120W Vero18 unit, huge improvement in thermal performance. Previously 14% temp droop, now 2%. He upgraded the heatsinks and fans and switched from thermal pad to thermal paste. The unit is very light. When you close the lid, the top rim of the fans...

Lately there have been Vero spec updates and price drops. Now Bridgelux has announced the new version of the Vero which is said to be shipping now, although I am not sure we could get the V2 from Digikey. If I recall they had almost 1000 Vero29 3000K in stock and it dropped down to 200 so maybe...

I have never seen the famous viral video, luckily, I learned that lesson by looking at Rotten.com when the internet first came out. Anyway, I retrofitted a pole lamp with a Vero 10 2700K in the living room and ran it at 150mA (5W). It is nice but my wife needs more light sometimes. So I got a...

I have been avoiding this issue and focusing on efficiency for starters. We have that pretty well sorted out along with heatsinks, so now I am wondering how we can maximize our yield with reflectors. This is going to become important as we (hopefully) start to see commercial lamps cranking lots...

Wondering if this is legit in any way. It is on Amazon, eBay and has its own website. Looking at the smallest model for starters, allegedly 120W with a pair of Vero29s, a pair of Meanwell drivers and a pair of 40mm fans. Dissipation should be about 105W, so 58W for each Vero. That would put it...

Finally got around to organizing this and I figured it might come in handy for those who are designing DIY lamps. These charts show the surface area and surface area/cost for each of the Heatsink USA profiles. So in summary, the cheapest surface area is the 2.08" profile. It gives a lot of...

Just found this code, tested it and it works for purchasing tickets online. I hope it saves some members a few bucks :leaf: WMAPS for 10% off