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Thanks. PPMs are N-P-K-Ca-Mg It does look like nute burn to me, except that I've been feeding between 1.7 - 1.8 for the past 4-5 weeks and they were happy with that. Now even at a lowered 1.4, the burn is progressing. Perhaps with the slow transition to a 1-1-2 ratio, they require a lower...

For about a week I've noticed the tips of some leaves are turning brown. At first I thought some leaves were showing a slight mag deficiency, so I foliared a weak epsom solution. The leaf-tip browning continued to progress so I thought nute burn. I lowered EC from 1.8 to 1.4. Now several...

Right of course. I've already removed it and replaced it with another COB. I'm building another fixture but only have 3 COBs left at the moment so wanted to make sure it would be safe to run only 3 on my driver temporarily. Actually, I was surprised it was actually still emitting some light...

Brilliant. Thank you!

Thanks. All I can find is that the max output is 143v. Cannot find a minimum. However, this is apparently a constant current/constant voltage driver, so does that mean the output is always 200w @ 143v? Would that mean that instead driving 4 COBs at ~50w each, it would drive 3 COBs at ~66w...

I am at day 14 of flower and was hoping I could get some feedback on the mix I am feeding. Growing in coco/perlite, DTW. Plants look healthy, but I would like to optimize yield of course. How would you adjust this throughout flowering? Any boosts at some point? Should I lower N and increase...

I have 4x CXB-3590s in series on an HLG-185H-C1400B driver. This morning I noticed that the light was much dimmer than it should be. Looking at the LEDs I saw that one of them had exploded. Considering that Meanwell drivers are constant current/constant voltage, is it safe to remove the...

Ok my math is wrong again. The compound I have is K2SiO3. Molar mass of K2SiO3 = 154.2803 g/mol Molecular weight calculation: 39.0983*2 + 28.0855 + 15.9994*3 Element / Symbol / Atomic Mass / # of Atoms / Mass Percent Silicon / Si / 28.0855 / 1 / 18.204% Oxygen / O /...

Thanks ruwtz. I'm also in coco DTW. Agsil16 appears to somehow have a better SiO2 to K2O ratio than the reagent grade potassium silicate that I obtained. For mine, considering that SiO2 has a molar mass of 60 and K20 is 94, then 1 gram per gallon would provide me with 110ppm K and 62ppm Si...

"White" light is typically going to be a broad spectrum light which will include both reds and blues at varying intensities. So yes, you can mix "white" light into your fixtures without any issues. I would think it's best to use your broad spectrum "white" light as your primary lighting source...

I found 1 Kg of chemically pure Potassium Silicate (K2SiO3•nH2O) for under $10 from my chemical supply. It seems so many people are opting to rather purchase diluted solutions so I'm having trouble finding how much to add to my nutrient solution (Jacks 5-12-26). The composition is: K20 -...

Ok, so in response to my own post in case anyone else runs into this issue - I figured out that you need to enter K as K2O and P as P2O5. "The reasons why K2O and P2O5 were used to represent potassium and phosphorous instead of referring to the simple quantities of these elements are that...

I'm running Jack's but wanted to fine tune the nutrient profile for various stages of growth so tried to add Jacks Hydro 5-12-26 as a substance in Hydrobuddy. I'm getting a large discrepancy on the P value however. Profile provided by JR Peters: Dissolve 1.3 oz. (2 tbsp.) of 5-12-26 in 10 gal...

I think you're right about rock wool. Next batch I'll use jiffy pellets. I'll remove the dome now, but how should I then water the rock wool if I find it getting too dry, if not from the top? The room they are at the moment averages around 60-70% RH, but I'm pretty sure they will dry out...

The other day I left the dome lid off for about 6 hours and they still looked fine. No wilting. I'm still using the dome lid however more so to keep the temperature for the clones a little more stable. The room they are in fluctuates between 70 and 80 degrees, but the temps under the dome...

Ok thanks. Good to know. Will give them some more time. Was really worried I'd have to start over.

My 20 clones are at day 15 now and have not popped roots. They all look perky with some of the lower fan leaves starting to yellow a little, which is apparently considered normal. Growing impatient, I gently pulled apart the rockwool on two of them to check if they are even growing at all. See...

I've just built my LED fixture using 16x CXB3590's. If you're looking to learn some more about designing an LED solution, I highly recommend you watch the videos "gromau5" has on his YouTube channel under that name. He designs his own fixtures and provides a wealth of information about LEDs...

I had not heard of doing this and would be terrified to try it. Wouldn't cutting through the root mass like that cause a huge amount of stress?

Thanks. The coco/perlite has excellent drainage so I thought it's not really possible to over water. I'm starting to think it's a magnesium deficiency so I've ordered some epsom salt and will try adding 1 gram per gallon to my nutrient solution.