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The general concept you're looking for is daily light integral or DLI. You can deliver the same DLI over any period by varying the intensity of lighting and photo period. For instance 500 PAR for 24 hours is the same DLI as 1000 PAR for 12 hours. As far as the dark period goes. Everyone...

Where on Earth are you getting your information from? You are saying that C3 plants don't respire... "Carbs simply settle back down to the roots" "Cannabis only grows or has processes during photosynthesis. It just hibernates in the dark" this is just nonsense

Sorry dude this is so wrong... At night, plants can’t photosynthesize—it takes a certain level of light to get the process going. But they don’t just hang around idly waiting for light. They respire, which is a combination of eating and breathing. Respiration combines oxygen and the food...

For anyone reading this thread looking for more actual info... Don't listen to anyone saying pressing flowers is a waste of time. It isn't. 25-30% returns is easy with good material and proper hydration of your material. Some people struggle with yield and for anyone trying to improve yield...

What exact ppms? I stated information straight from the EPA on their website about what amount of mercury a leachate runoff test can have and pass for non hazardous classification. Those ppms are stated as general knowledge for waste handlers. You seem to just want to argue instead of just...

Lol, yeah they're my claims about Mercury. I just made that crap up

Now you're just trolling because I know you can use the Google search feature. Mercury is toxic, this isn't new

You are asking me if I have proof that mercury is toxic? Or suggesting that somehow the reduced "amount" could make it so they are "less toxic" enough to just dispose of? And that we should listen to the EPA about such nonsense? You can actually find out what the "standard" amount of mercury...

Rapid LED sells a lot of good DIY horticulture set ups. You'll think less and get set up pretty quick with their stuff. I like the COBs. The CXB3590s can run at 3600ma but I run them at 1400 and they still give me 1500 PAR where I want it. Easy to get coverage too

Yay! It's gone!

Those bulbs may not be categorized as hazardous waste by the EPA but they still have mercury in them which should definitely not just be thrown away.

To clarify about my statement "PAR is PAR". Spectrum can greatly affect the growth of any plant. More blue, more red, etc...what I meant was that you can get LEDs that compare to MH spectrums and you can get LEDs that compare to HPS spectrums and they will deliver more of that PAR for the same...

Grams per watt is just a benchmark that people try to measure themselves against; it's useful in certain terms. However, it doesn't account for a lot of variables that contribute significantly to yield such as veg time, PAR and Daily Light Integral, growing type, training, etc... For instance...

Cold temps make phosphorus less available and you only experience this in colder temps?... It could be there just not very easily taken up and or it's in a lower quantity so the cold temps are pushing things a little too far; that would make sense based on your statement that at 72 they're...

Plants turn purple in cold temps with phosphorous deficiency and the leaves curl in strange ways just like yours are. With the pattern on those leaves it certainly looks like deficiency. The plant is pulling nutrients out of those leaves and that's why you see the interveinal coloring and also...

On a smaller grow it's more important to maximize your efficiency. You're suggesting that a PAR meter is a waste of money, just an expensive and unnecessary thing for a home grower. Or it's only something for commercial growers. I'm suggesting that it is a valuable tool that can be...

Even if you don't want to get scientific a PAR meter will pay for itself quickly. why wouldn't you invest in a tool that will increase your yield by more than the tool is worth in a short time? If you're talking about money and being able to "throw it around" I can tell you the reason im able...

When doing something that can be measured, especially something so important to growth as photon energy, I would prefer to not make assumptions, even "reasonable" ones. I'd rather know exactly what my plants are getting because it's a huge variable that affects everything else. If you don't...

Talking about grow lights in terms of wattage for grow power is ignorant, simple at that. Learn about PAR and daily light integral.

Definitely get an RO system if you're serious about water quality. We've got a 75 gallon per day 4 stage that we get 0ppm from. Check out bulk reef supply they've got good units and the price is right. My tapwater comes out about 130ppm. About 50 calcium and 40 magnesium so it's great top off...