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Hey -- almost 4 weeks into flowering and there's something wrong here... I've been thinking potassium deficiency, but it's not getting better with added nutrients. Pictures first, then all the details I can think of: First, the overall yellowness of the photos is the lights -- homemade...

I just finished a build of two roughly 2ft x 2ft lights, each with 9 Bridgelux EB strips (22 inch) run off a Meanwell HLG-120H-C700B. The first one, no problems. When I fired the second one up for the first time this morning, only two LEDs on one of the end strips lit. Strange. As soon as I...

I have my 22" strips and am getting ready to wire them up. Maybe a stupid question: Each strip has four connectors on it -- two positives and two negatives, with a pair of each at either end of the strip. I'm guessing that's for convenience, and that I can use either pair. (Good so far?) Can...

I've read that you can't use a lux meter with LEDs, which made sense thinking about the "blurple" LEDs. But I don't see why it wouldn't be useful with COBs and other white light LEDs. (I know that a PAR meter would be better, but I'm looking for a relatively cheap way to gauge how much light...

I have a 2ft x 4ft tent and I'm thinking of building 4 lights: Two 2x2 veg lights and two 2x2 flower lights. I was looking at COBs, but I like the LED strips for their evenly spread out coverage and their thermal properties -- no heat sinks needed. I'm aware of two options, the Bridgelux EB...

If you buy "activated carbon" in "pellets," are they all pretty much the same, or are some actually better quality? The "Acurel Economy" activated carbon pellets I recently bought cost me $20 for 9 pounds (on Amazon); you can pay a lot more -- for example Amazon has "Premium Laboratory Grade...

I'd like to stop feeding nutrients 2 weeks before harvest; how do I decide when that is? My Northern Lights plants are in their 5th week of flower, so I'm guessing they have somewhere between 3 and 5 weeks left. I don't want to stop feeding them too early, and I also don't want to find myself...

How many 23W CFLs would you use in a 5-gallon "space bucket" that was only going to be used to start seedlings? (They'll be in the bucket for about 2 or 3 weeks, then they'll get transferred to the grow tent.) Thanks.

So I recently learned that my tap water has about 400 ppm total dissolved solids (and my town reports that it has 62 ppm sodium and 94 ppm calcium carbonate). This I discovered while trying to figure out what's wrong with my plants, which are in their 4th week of flower after 2 months of veg...

This was a surprise. I have two plants that have been treated exactly the same. One has been doing slightly better than the other all along, which I think is natural -- different individuals. Recently the one doing better developed what I think is a potassium deficiency (see...

What do you think? Growing in soil; 3 1/2 weeks into flower. I recently started giving FF Big Bloom every other watering; could increase to every watering, or give a higher concentration.

I just got a Hanna pH pen, calibrated it, watered my plants, and stuck it in the soil to take a reading. Which worked fine, but the soil (and especially bits of perlite) gets jammed up in opening that holds the electrode, and it was a real pain to clean. It's hard to imagine the pen can stand...

Hi All, First let me say I love RIU. I'm in the middle of my first grow, there's so much to learn, and I can (and do!) literally spend hours just absorbing knowledge from this site. As we all know, it was down for a few days recently, and during that time it started to seem -- to me, at least...

Hi all -- My newest growth is showing yellowed leaf tips, and I have one tiny necrotic (dead) spot on a fan leaf. So I think I am seeing the first signs of some problem, most likely a nutrient deficiency. The plants are in soil: 10 parts FFOF, 4 parts perlite, 1 part vermiculite; they were...

I have two "300W" LED panels (they actually draw half that amount) that have switches for VEG and BLOOM. I've had my young plants under VEG alone (so about "150W"), because my understanding is that the blue light is more important than the red light until they're flowering. Which would you...

Here I intend to describe some of the things I've done wrong over the past couple of months while gearing up for and then starting my first grow, in the hope that maybe some of my fellow newbies will be able to dodge some of the traps I walked right into. And also to vent... I should probably...

Hi All -- First grow here (two Northern Lights seedlings). There are some roots starting to show through the bottom of my 4 inch square pots, and I'll be transplanting within the next couple of days. I'm planning to mix up some FFOF and perlite, and transplant into 7 gallon pots. So my main...

Apologies to those who also monitor the "Indoor Growing" forum, but I have seedlings under LED lamps and I'm wondering if the damage I'm seeing is due to the lights. A picture: I have two plants; each is under a Nova N300S "300W" lamp, switched to the "VEG" setting so it is essentially on...

I came up with a cheap and simple way to test the throughput of an inline fan, so I could see how my carbon filter and ductwork affected it. It's definitely not too precise, but way better than nothing. And the results were surprising. The basic idea: Take a large garbage bag, tape up the...

Hi All, I have two Northern Lights seedlings. I planted them in soil (1 part FoxFarm Ocean Forest, 1 part vermiculite) about a week and a half ago, and they both germinated about 4 or 5 days ago. Here are a couple of pictures of one of them (I just misted it, hence the water droplets)...